# Find the value of the expressions. 3 x = 3 x = = ( ) 9 = 60 (12 + 8) 9 = = 3 9 = 27

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1 PreAlgebra Concepts Important Concepts exponent In a power, the number of times a base number is used as a factor order of operations The rules which tell which operation to perform first when more than one operation is used. 1. Simplify expressions inside parentheses. 2. Find the value of all numbers with exponents. 3. Multiply OR divide in order from left to right. 4. Add OR subtract in order from left to right. evaluating algebraic expressions Substitute values for the variables and evaluate using the order of operations above. Examples In 5 3, the exponent is 3. So, 5 3 is equal to 5 x 5 x 5 or 125. Find the value of the expressions. 3 x = 3 x = = ( ) 9 = 60 (12 + 8) 9 = = 3 9 = 27 Find the value of the expression if x = 3, y = 5, and z = 20. 2x + z y = = = = 10 Evaluate each algebraic expression for x= 12, y = 8, and z = 2. Write your work on the lines provided y 2 z 2. ( x + y ) ( y + 1 ) 2 x 4. 5x z 3

2 Data Analysis Important Concepts mean The sum of the values divided by the number of values in the set. median The number that marks the middle of an ordered set of data. mode The mode is the value that occurs with greatest frequency in a set of data. range The difference between the greatest and least values in a data set. Examples {1, 2, 3, 4} = 12 and 12 4 = 3 so the mean is 3 {4, 5, 6, 7, 8} The median is 6 because it marks the middle value when the numbers are ordered from least to greatest. {1, 2, 2, 2, 3, 4} The mode is 2 because it is the value that occurs most often. {1, 2, 3, 4, 5} The range is 4 because 5 1 = 4. Use the data table to answer each question. Calories of Selected Vegetables (per serving) What is the mean of the calories? Round to the nearest tenth, if necessary. 2. Order the set of data from least to greatest. What is the median of the calories? 3. What is the mode of the calories? How do you know? 4. What is the range of the calories?

3 Basic Integer Concepts Important Concepts integer The set of numbers that includes all the whole numbers and their opposites, including 0. negative integers All integers less than zero and found to the left of zero on the number line. positive integers All integers greater than zero and found to the right of zero on the number line. opposites Two numbers the same distance from zero but in opposite directions on the number line. *The sum of two opposites is 0. absolute value The distance a number is from 0 on the number line. Absolute value is never negative. Examples {...-4, -3, -2, -1, 0, 1, 2, 3, 4...} and 4-9 and 9-36 and and 17-9 = 9 8 = 8-13 = = 100 Identify numbers that meet the given requirements positive numbers that are not integers 2. 2 negative numbers that are not integers Graph the given numbers on the number line. 3. 6, 0, -5, 1, -3 Insert <, >, or = to make a true statement Name the opposite of each integer given Identify the absolute value x 6 14

4 Ratio and Proportion Important Concepts ratio A comparion of two numbers by division. Does NOT have to be a PART to WHOLE comparison. Can be written in 3 forms a, a to b, a:b b ratio of triangles to circles Examples ratio of nonpolygons to polygons 3, 3 to 7, 3:7 7 7, 7 to 6, 7:6 6 Corresponding sides of similar shapes are in proportion. All measures shown are in units. proportion An equation that shows that two ratios are equivalent = Use the numbers to write ratios for #1-3. Write each ratio in 3 forms ratio of square numbers to nonsquare numbers 2. ratio of negative integers to positive integers 3. ratio of abundant numbers to total numbers Use a proportion to solve this problem. 4. Kara read 90 pages in 30 minutes. If she continues to read at this rate, how many pages can she read in 55 minutes?

5 Probability Important Concept probability Probability is the likelihood that an event will occur. Probability can be expressed as a fraction, decimal, or percent. Examples You are rolling a standard number cube {1, 2, 3, 4, 5, 6}. Find the probability of each event. 1 P(5) = P(even number) = = 6 2 P(event) = number of favorable outcomes number of possible outcomes The probability of 2 events occurring can be found by multiplying the probability of each independent event. P(composite number) = P(4, 6) = P(1, prime number) = 2 1 = x = x = The letters T, H, E, O, R, E, T, I, C, A, and L are put in a bag. Find each probability. 1. P (A, I, or O) = 2. P (not O or T) = 3. P (U) = You choose 1 letter from the bag and then put in back before choosing a second letter. Find each probability. 4. P (T, vowel) = 5. P (E, T) =

7 Operations with Decimals Addition Algorithm Subtraction Algorithm 1. Line up equal place values so you are adding equal sized pieces. 2. Put in zeros as place holders, if necessary. 3. Add beginning with the smallest place value. 4. Bring down the decimal point into the sum. Multiplication Algorithm 1. Line up equal place values so you are adding equal sized pieces. 2. Put in zeros as place holders, if necessary. 3. Borrow and rename when necessary. 4. Subtract beginning with the smallest place value. 5. Bring down the decimal point into the difference. Division Algorithm 1. Multiply as you would with whole numbers. 2. Find the sum of the decimal places in both factors. 3. Count the same number of decimal places going right to left in the product and place the decimal. example: tenths x tenths = hundredths 1 place + 1 place = 2 places 1. If the divisor is a whole number, bring the decimal straight up into the quotient. Follow your division algorithm for whole numbers, adding zeros to the dividend as necessary. 2. If the divisor is a decimal number, multiply divisor and dividend by a power of ten that will make the divisor a whole number. Then follow your division algorithm for whole numbers, adding zeros to the dividend as necessary. Solve each problem. Use separate paper if necessary. NO CALCULATORS! ( 9.9) x 0.1

8 Solve for n Making a fact family may help you n = n = n n = = n = n = n = n 0.5 = 6.4

9 Geometry and Measurement Important Concepts Examples base Linear measurement used with rectangles, triangles, and parallelograms, usually along a horizontal side. base base height Linear measurement used with rectangles, triangles, parallelograms, and trapezoids to represent the perpendicular distance from the topmost point of the polygon to the base. h h area The measure of the amount of surface covered by the boundary of a figure. Measured in square units. perimeter The measure of the distance around a figure. In circles, the perimeter is called the circumference. Area formulas for... rectangle A = bh triangle A = bh 2 parallelogram A = bh trapezoid A = (b 1 + b 2 )h 2 circle A = πr 2 For polygons, perimeter is found by the sum of the sides. For circles, circumference is found C = πd. Find the area and perimeter/circumference for each of the shapes given x 10 units 10 cm 9 units in in 8 units 7 units in

10 Mixed Problem Solving Tips for Problem Solving Read the question first so you know what you need to find. Underline the important facts as you read the entire problem. Look for key words as you read. Plan how to solve the problem. Find the solution and check your solution for reasonableness/accuracy. Remember to label your solution. Solve each problem. Show work to support your answer. You may use a calculator on this section. 1. Laura has 121 carpet tiles. Each tile is a 1-foot by 1-foot square. Can she use all of the carpet tiles to make a square pattern without cutting any of the tiles? 2. A florist has 28 white roses, 35 red roses, 14 pink roses, and 70 yellow roses to use in making floral arrangements. He wants to use all the flowers and place an equal number of each color rose in each arrangement. Find the greatest number of floral arrangements he can make. How many of each kind of flower will be in each arrangement? 3. According to a survey, 9 in 10 teens volunteer at least once a year. Of these, onethird help clean up their communities. What fraction of teen volunteers help by cleaning up their communities? 4. A triangle has side lengths measuring 3 and 7. The measurement of the longest side is missing. Ted says that one possibility for the unknown side length is 11. Is Ted correct? Why or why not?

11 5. Find the perimeter and area of the figure below. 7 cm 5 cm 6. Claire and Chad want to design a rectangular pen for their new puppy. They want the pen to have an area of 48 square feet. Fencing costs \$0.85 per foot. What would be the dimensions and the cost of the least expensive pen Claire and Chad could build, assuming the side lengths are whole numbers? 7. The figure below shows the dimensions of Adam s bedroom. Adam wants to put new carpet in the room. How much carpet will Adam need? The Make A Difference Club raised 30% of their fundraising goal of \$200. What percent do they have left to earn? How much money do they have left to earn? 9. Alexa wants to use ready-made 6-foot long fence sections for her yard. The yard is a rectangle with dimensions 30 feet by 36 feet. How many fence sections will she need to enclose her entire yard?

12 10. The Midtown Middle School cheerleaders earned \$175 at a car wash. If this amount is 25% of the cost of a new set of uniforms, what is the total cost for a set of uniforms? 11. Skateboards are on sale at Susan s Skateshop for 30% off. If the regular price of a skateboard is \$89, what is the discounted price with a 7% sales tax? 12. Triangle ABC ~ triangle DEF as shown below. Use the diagram to answer parts a and b. A G B 22 C E 3 cm F a. If corresponding sides are in a 4:1 ratio, what is the measure of side BC? b. What is the measure of angle E?

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