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# Math Practice For 3rd Period Exam

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### Math Practice For 3rd Period Exam

1. 1. COLEGIO SAN PATRICIO ANSWER KEY Math Practice for 3rd Period Exam School Year 2009 – 2010 Binary System 48 = 110000 104 = 1101000 58 = 111010 202 = 11001010
2. 2. The Number Line Write the missing numbers. Order the next numbers in the number line. 0, , 0.50 , , 1 , 1.25 , 2 Answer the next problems. Is it correct? 1. 2x + 6 = 12 CORRECT Two times a number, plus six is twelve. 2. (5) (6) − x = 25 INCORRECT Five times the difference of six 5(6−x)=25 and a number is twenty five. 3. 8(4 + 9) = 104 CORRECT Eight times the sum of four and nine is one hundred four. Solve. 1. If 2/3 of the pizza is left, what part will you and your two friends get? A: for each. (You divide 2/3 by the 3 friends) 2. My brother will be forty years old in forty years. Let b be the age of my brother now: A: b) b+4 = 40
3. 3. 3. Donna got 84 in a quiz, which includes 5-point bonus. Let x be the grade she would have had without the bonus. A: c) x + 5 = 84 4. I have to check 90 exams. I have checked 35. How many exams am I missing? A: Possible equation: 90 −35 = x I am missing 55 exams 55 = x 5. One trip is ¾ kms. If we decide to take 6 trips, how many kilometers are we going to travel? A: 4 ½ kms. (You multiply ¾ by the 6 trips) 6. You are shopping for earrings. The sales tax is 5%. You have a total of \$18.37. What is your price limit for the earrings? A: The price limit is \$17.49. Solution:
4. 4. Simplify the expressions. 1. −6(a+8) −6a−48 3. 4(1+9x) 4+36x 2. 6(−5n+7) −30n+42 Write each as an algebraic expression. 1. The difference of 10 and 5 10−5 2. The quotient of 14 and 7 14÷7 3. u decreased by 17 u − 17 4. The product of x and 7 7x 5. Twice q 2q