Ideas beyond Number. Activity worksheets
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1 Ideas beyond Number
2 Activity sheet 1 Task 1 Some students started to solve this equation in different ways: For each statement tick True or False: = = = = Task 2: Counter-examples The exception disproves the rule Find a COUNTER-EXAMPLE to show that each of these CONJECTURES is FALSE: 1. Square numbers only end in,, or. 2. Cube numbers can end in any digit except. 3. The product of two numbers is greater than either of the two numbers. 4. The square of the number is greater than the number. 5. Adding two numbers and then squaring them gives the same result as squaring them and then adding them. 6. Division always results in a smaller number. 7. Every whole number is either a cube number or is the sum of,, or cube numbers. 8. The sum of two numbers is greater than their difference. 9. The sum of two numbers is always greater than zero. 10. The product of two numbers is greater than their sum. Page 2 of 11
3 Task 3: Developing algebraic reasoning Decide whether each of the following are: always true sometimes true never true. Convince a friend 1. Three consecutive numbers sum to a multiple of three. 2. Three consecutive numbers sum to a multiple of For three consecutive numbers, the product of the first and the last is 1 less than the middle squared. 4. The sum of two consecutive triangle numbers is a square number. 5. An odd number added to an odd number always gives an even number. 6. When you add together consecutive odd numbers you get a square number. 7. Add 1 to the square of an odd number. You always get an odd number. Hint: the technique is: A. Try some examples and see if you can find cases that comply then the conjecture is true sometimes. B. Then to look for a counter example and if you find one then the conjecture is not always true. C. If you cannot find a counter example fairly quickly, then in these cases algebra should provide a more formal PROOF. Page 3 of 11
4 Activity sheet 2 Further development of algebraic reasoning Task 1 represents a square number; is an integer. 1. Think about the expression. Explain how you know there are values of for which this expression does not represent a square number. 2. Explain why the expression must represent a square number. Task 2 Kate is solving the inequality. She says: whenever is less than. Kate is not correct. Explain why. Task 3: Teacher-led activity Your teacher will give you a statement investigate it! Is it true? If not, can you find a counterexample? If so, can you prove it? Page 4 of 11
5 Activity sheet 3 Task1: The Wason Test Your teacher will introduce you to the Wason Test. How did you do on the Wason Test? How did your classmates do? What do you think this shows about human beings and logic? Task 2: Three digits 1. Take any 3 digits. 2. From these digits make six different number pairs. 3. Add them up. 4. Add the three original digits. 5. Divide the larger of the last two answers by the smaller. 6. Write down the result. 7. Choose another set of three digits and repeat. 8. Write down briefly what you find. 9. Try to prove it will always be true. Task 3: Consecutive sums etc Investigate. Are there some whole numbers that cannot be expressed as the sum of two or more consecutive numbers? Which are they? Why? Page 5 of 11
6 Activity sheet 4 Consecutive sums revisited What is the next line? What is the th line? Can you prove it? Page 6 of 11
7 Activity sheet 5 However you slice it (challenging proof activity) Draw a circle, and place two points on its circumference. Join these points with a line. The interior of the circle is then divided into two regions. Now draw another, and place three points on its circumference. Join each of these points to the other two. The interior of the circle is then divided into four regions How many regions are formed if you place four points on the circumference? Five? Six?? Make a conjecture. Test your conjecture. Page 7 of 11
8 Refine your conjecture First, some definitions: An external node is a point on the circumference of the circle. A cut is a line joining two external nodes. external node external node cut An internal node is the intersection of two cuts. An external arc is part of the circumference of the circle joining two external nodes. An internal arc is any other line joining two nodes. Page 8 of 11
9 external arc internal arc internal node internal arc A region is an enclosed area. Draw up a table relating the number of external nodes to the number of external arcs, cuts, internal nodes, internal arcs and regions. Look for patterns in this table. Frame some conjectures. Can you prove them? Things you might find useful along the way 1. Getting choosy The number of ways of choosing two objects from three is written, and said three choose. Its value is. Similarly, the number of ways of choosing two objects from four is written, and said four choose. Its value is.. Page 9 of 11
10 Questions 1. What are the values of choose and choose? 2. What are the values of 6 choose, choose and choose? 2. Pascal s triangle This is Pascal s triangle: To make each number in Pascal s triangle, add together the two directly above it: for example,. 3. What s the connection between Pascal s triangle and the choose numbers? 4. What s the connection between Pascal s triangle and the nodes, arcs and regions table? 3. Euler s formula for plane graphs A plane graph is a collection of points (nodes) connected by lines (arcs) and dividing the page into regions In this example, there are 4 nodes, 6 arcs and 3 regions. Euler s formula says that if there are nodes, arcs and R regions, then in every case,. Page 10 of 11
11 5. Does Euler s formula apply to this example? 6. Check Euler s formula on some plane graphs of your own. Does it work? 7. Our nodes and regions diagrams are plane graphs. Does Euler s formula work for them? Page 11 of 11
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