# Introduction. It gives you some handy activities that you can do with your child to consolidate key ideas.

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1 (Upper School)

2 Introduction This booklet aims to show you how we teach the 4 main operations (addition, subtraction, multiplication and division) at St. Helen s College. It gives you some handy activities that you can do with your child to consolidate key ideas. It also contains a maths dictionary of core language. It is important to note that this by no means covers all of the maths topics that we teach your children.

4 Standard written methods of addition A standard vertical recording Always begin with the units column An addition which involves a carry Forward / over Write the digit carried underneath the next column along An addition which involves two or more carry forwards An addition which involves four or five numbers with different numbers of digits IMPORTANT...DIGITS MUST BE RECORDED IN THE CORRECT PLACE VALUE COLUMNS WITH ONE DIGIT PER SQUARE.

5 SUBTRACTION SUBTRACTION Language of subtraction subtraction, subtract, take away, minus, reduce, decrease, less difference between count on, count back exchange, column Mental strategies for subtraction Subtracting a multiple of 10: = 36 7 tens take away 4 tens equals 3 tens Subtracting a two-digit number: = 36 (take away tens and then the units) = = = = 36, 36 8 = 28 Subtracting a near-multiple of 10: = = 776, = = = 278, = 276 Subtracting two-digit / three-digit multiples of 10: = 14 so = 140

6 Standard written methods of subtraction A subtraction without exchanging Always begin with the units column Exchanging a thousand Start at the units and work left. Firstly 8-4=4. Secondly 7-1= When a number cannot be subtracted you will need to exchange. In this case, exchange from the thousands Exchanging a thousand and a hundred Exchanging a thousand, a hundred, and a ten

7 MULTIPLICATION MULTIPLICATION Language of multiplication times, multiply, multiplied by, product, double, halve factor, multiple groups, sets, lots of, teams Mental strategies for multiplication Multiplication facts for 2 to 10: Six times four. What is the product of nine and four? Multiply three by seven. Finding products mentally involving multiples of 10 / 100 / 1000: 7 x 9 = 63 so 70 x 9 = x 8 = 32 so 4 x 800 = x 3 = 18 so 6 x 3000 = Multiplying a two-digit number by a single digit: 6 x 37 6 x 30 = = x 7 = 42 Mental multiplication by 99, 100, 101: 100 x 34 = x 34 = 3366 is the same as 100 sets of 34 (3400) minus one set of = x 34 = 3434 is the same as 100 sets of 34 (3400) plus one set of = 3434

8 Standard written methods of multiplication Short Multiplication Multiplying a two-digit number by a one-digit number Long method 38 x 5 40 (5x8) (5x30) 190 Short method 38 x Long Multiplication Multiplying a two-digit number by a two-digit number 65 x (4x65) (30x65) When multiplying by the tens (30) you must put a zero as a place marker before calculating 3 x 5 Multiplying a three-digit number By a two-digit number 328 x (5 x 328) (40 x 328)

9 DIVISION Language of division share equally between, divide, divided by, quotient, divisible by, left over, remainder, round to the nearest ten / hundred Mental strategies for division Division facts for 2-10, varying the division language: Divide thirty-six by nine. How many sixes are in forty-two? What divided by eight gives four? Share fifty-six equally among eight. What is one fifth of thirty-five? Mental divisions where there will be a remainder: Describe a scenario where 17 mats are shared equally among 5 restaurant tables and ask How many mats will be on each table? Three... and how many mats will be left over? Two 175 = 3 r 2 Halving Find half of 178: Half of 100 is 50. Half of 78 is 39. So half of 178 is 50 plus 39. That s 89.

10 Standard written methods of division Short method r = 322 r will go into 9 three times. 3 will go into 6 twice. 3 will go into 8 twice and there will be two left (the remainder) r = 1143 r will go into 9 once and there will be one left. 8 will go into 11 once and there will be three left. 8 will go into 34 four times and there will be two left. 8 will go into 25 three times and there will be one left (the remainder). Long method 2 2 r will go into 51 twice. (23 x 2 = 46) Take away 46 from 51 (51 46 = 5) Bring down 1 to become will go into 51 twice (23 x 2 = 46) Take away 46 from 51 (51 46 = 5) 5 is the remainder r You must estimate and find out how many times 34 will go into 87: (34 x 2 = 68) Take 68 away from 87. (87-68 = 19) Bring down 5 to become 195. You must estimate and find out how many times 34 will go into 195: (34 x 5 = 170) Take away 170 from 195 ( = 25) 25 is the remainder.

11 Generic activities which can be adapted for different topics and levels of mathematics 1) Target Ask your child to make a target number, specifying the rule or rules they should apply. For example:...by adding two single-digit numbers (9 + 8 = 17) Make seventeen......by adding a teens number ( = 17)...by adding three numbers ( = 17)...by subtracting 10 from a number Make fifty-three......by subtracting from sixty 2) Describe a number Write a two-digit number and ask your child to say as many different things as possible about it. For example: 36 it is one more than thirtyfive it is between thirty and forty its two digits make nine when you add them it is four less than forty

13 NUMBERS TO 100, then 1000 Language: Counting on and back in ones, twos, threes, fours, fives, tens, hundreds, odd, even, larger, smaller, largest, smallest, order, before, after, between, one more, two more, one less, two less. The hundred square: Display a hundred square and ask your child to: Say a sequence, for example, from 20 to 30, forwards and backwards Continue the sequence, from any number, forwards and backwards Point to numbers given orally Give the numbers before/after a given number Give the numbers 1 or 2 more/less than a given number State a number between, for example, 22 and 24 Display a hundred square and ask your child to identify patterns: Count from ten in tens to 100 (10, 20, 30, 40 etc.) Count from a one-digit number in tens to 100 (3, 13, 23, 33 etc.) Further counting activities: Count in 2s to 100 Count in 5s to 100 Place Value: Number 23 is made up of 2 tens and 3 units - Drawing your own number line: Your child will be taught how to draw their own number line to enable them to calculate answers = = =

16 Adding a teens number and a two-digit number: = 39 a) Lay out 2 tens sticks and 3 loose cubes. Lay out 1 tens stick and 6 loose cubes. Count up the tens and continue with the units. b) Start at 23 add 10 and then 6 your child could draw their own number line to calculate this SUBTRACTION Language: Take away, subtract, minus, leaves, How many are left?, difference between, How many more?, take four from seventeen,, subtract eight from sixteen, three less than twelve. Subtraction to 20: Linking to addition a) Display two ten-frames, side-by-side, with fifteen green circles and five orange circles = 20 so 20 5 = 15 b) Display a strip like this How many red and blue squares are there? (9 and 8) What is the sum of nine and seven? = 17 The related subtractions 17 8 = 9 and 17 9 = 8 Subtracting a single-digit number: 17 4 = 3 a) Using a number line, start at seventeen (the bigger number) and count/jump back 4. b) Lay out a stick of ten cubes and seven loose cubes. Take away/set aside three. Count the cubes. Point out that 7 4 leaves 3. The answer is 10 and 3, 13. c) Hold 17 in your head and count back 4.

17 Subtraction to 100: Linking to known subtraction facts: Show a subtraction such as 9 5 and calculate 9 5 = 4 Link to facts 9 5 = = = 24 Subtracting 10: = 32 a) Using a number line, start at 42 (the bigger number) and count back ten. b) Using a hundred square, start at 42 and count back ten/ move to the number above. Highlight that the units stay the same and the tens column decreases by one. Subtracting mentally multiples of 10 using known facts: 7 3 = 4 so = = 4 so = 40 Subtracting a teens number from a two-digit number: = 22 a) Using a number line or hundred square, start at 38 and count back 16. c) Lay out 3 tens sticks and 8 loose cubes. Take away 1 ten and 6 units (loose cubes). c) Hold 38 in your head and count back 16. d) Take away a 10 and then 6: = = 22 Finding a small difference What is the difference between between 38 and 3841? and 41? Place counters on a number line. Count back from 41 to 38 or on from 38 to 41 to show that the difference is 3. Record: = 3 The answer can be found mentally, perhaps using fingers, by counting on from 38 or counting back from 41.

19 DIVISION Language: Share, group, halve, half, divide, divided by, How many twos are in twenty?, How many in each share? Activities for division Division is introduced by sharing using materials. Using pencils/counters share out an equal amount of objects, for example: Show how to record: 12 3 = 4 Use language twelve divided by three is four twelve shared among three is four MONEY Language: Buy, spend, cost, sell, money, coins, amount, pay, change, pence, pounds, How much altogether?, same value, fewest coins. Activities with money Display a collection of coins (10p, 5p, 2p, 1p). How much money is there? Encourage your child to start with the coin of greatest value. When your child is confident in using 10p, 5p, 2p and 1p, introduce the 20p coin. Attach prices to objects and ask your child to count out coins that would be needed to pay for the item. Encourage your child to use the fewest coins possible. When your child is confident in using 10p, 5p, 2p and 1p, introduce the 20p coin. Find different ways of making 20p, for example: 10p + 5p + 2p +2p +1p = 20p or 5p + 5p + 5p +5p = 20p Introduce the 50p coin and find ways of making 50p, for example: 20p + 20p + 10p = 50p or 10p + 10p +10p + 10p + 5p + 5p = 50p 20p + 20p + 2p + 2p + 2p + 2p +2p = 50p Introduce the 1 coin and find ways of making one pound, for example: 50p + 50p = 1 or 20p + 20p + 20p + 20p + 20p = 1

20 Maths Dictionary angles - Type of Angle Description Acute Angle an angle that is less than 90 Right Angle an angle that is 90 exactly Obtuse Angle an angle that is greater than 90 but less than 180 Straight Angle an angle that is 180 exactly Reflex Angle an angle that is greater than 180 area area is a measure of the total surface of a shape or object. You can find the area of a square or a rectangle by multiplying its length by its width area = length x width capacity the capacity of a container is the amount of water or other liquid that it will hold. conversions - Length 1 km = 1000m 1m = 100cm 1cm = 10mm Weight 1 tonne = 1000kg 1kg = 1000g 1g = 1000mg Capacity 1l = 1000ml 1cl = 10ml circumference the circumference is the distance all the way around the edge of a shape. congruent two shapes are congruent if they are exactly the same. One shape can be placed exactly on the other. cubic number when you multiply a whole number by itself twice, the answer is called a cubic number. 3 x 3 x 3 = 27 denominator the denominator is the number below the line in a fraction. diameter a diameter is a line that cuts a circle in half. It passes through the centre of the circle. difference the difference is the number you must count on to get from a smaller number to a bigger one. digit a digit is any one of the following: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. The number 143 is made up of three digits. equation an equation says that one thing is equal to another. Every equation has an equals sign, which shows that the numbers to the left of the sign are the same as, or equal to, the numbers to the right of it. factor a factor is a number that you can divide into another number without leaving a remainder. For example, 2 divides into 8 four times with no remainders. So 2 is a factor of 8. Ten has four factors : 1, 2, 5 and 10 hypotenuse the hypotenuse is the longest side of a right-angled triangle.

21 integer an integer is a whole number. An integer can be a positive number such as 1, 2, 3 etc., or a negative number such as -1, -2, -3 etc. Zero is also an integer. Quadrilateral A shape with 4 sides, 4 vertices and the interior angles add up to 360 mean the mean of a set of numbers is one way of measuring the average. You find the mean by adding all the numbers together and dividing by how many numbers there are. median the median is the middle, or central, number in a set of numbers. If you line up five children in the order of their heights, the child in the middle has the median height. The median is often close to, but not always the same as, the mean. multiple - an answer in a given times-table: 4, 8, 12, 16, 20 are multiples of 4 6, 12, 18, 24, 30 are multiples of 6. mode the mode is the most common number in a set of numbers. numerator the numerator is the number above the line in a fraction. perfect number - a perfect number is a number whose factors (apart from itself) add up to the number. For example, the proper factors of 6 are 1, 2 and = 6 perimeter the perimeter is the edge, or boundary, of an area. The perimeter of a curved shape is the same as its circumference. perpendicular two lines are perpendicular if they meet or cross at a right angle. Place value - The value of where the digit is in the number, such as: units, tens, hundreds, etc. Example: In 352, the place value of the 5 is "tens" Example: In , the place value of the 9 is "hundredths" polygon a polygon is a flat, or plane, shape with three or more straight sides. Number of Sides Name of Polygon 3 Triangle 4 Quadrilateral 5 Pentagon 6 Hexagon 7 Heptagon 8 Octagon 9 Nonagon 10 Decagon 11 Hendecagon 12 Dodecagon polyhedron a polyhedron is a solid shape with straight edges. When each of the faces of a polyhedron is identical, we call it a regular polyhedron. There are five different regular polyhedra: Tetrahedron 4 triangular faces Cube 6 square faces Octahedron 8 triangular faces Dodecahedron 12 pentagonal faces Icosahedron 20 triangular faces.

22 prime number a prime number is any whole number, apart from 1, that can only be divided by itself and by 1 without leaving a remainder. The first four prime numbers are 2, 3, 5 and 7. prism a prism is a solid shape with matching ends. The ends are shaped like triangles, squares or polygons. A prism has the same cross-section all the way along its length. product the product is the answer you get when you multiply together two or more numbers. The product of 2 and 3 is 6. 2 x 3 = 6 quotient the quotient is the number of times that one number will divide into another number. It is the whole number part of the answer to a division sum. radius the radius is the length of a straight line from the centre of a circle to its circumference. rotation a rotation means a turn. A complete turn always brings a shape back to its starting point. We say that shapes like squares and equilateral triangles have rotational symmetry because they look the same after less than a full turn. square number when you multiply a whole number by itself the answer is called a square number. 3 x 3 =9 7 x 7 = 49 The square root of 9 is 3 The square root of 49 is 7 sum the sum of two or more numbers is the answer you get when you add them together. The sum of 2 and 3 is = 5 symmetry a shape has symmetry when two or more of its parts are matching shapes. There are different kinds of symmetry: Rotational symmetry when an object looks exactly the same when it is turned by an angle less than 360 degrees. Reflection/mirror symmetry when one half of a shape is the mirror image of the other half. three-dimensional a solid shape is three-dimensional because it has length, width and height. time - Normally the time is shown as Hours : Minutes. There are 24 Hours in a day and 60 minutes in each hour. There are two main ways to show the time: "24 Hour Clock" or "AM/PM": total the total is the result when you add together a group of numbers. The total of 6 and 4 is = 10 translation a translation is a movement of a shape in a straight line. triangular number a triangular number can be arranged as dots in the shape of a triangle. The number of dots is the same as the number itself. The first five triangular numbers are 1, 3, 6, 10, and Add another row of dots to the base of the triangle to find the next triangular number. two-dimensional a two-dimensional shape has length and width but no height. A plane shape is two-dimensional.

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