COLEGIO SAN PATRICIOMath Practice for 3rd Period Exam

School Year 2009 – 2010

Name: ___________________________________________________ 7th: _____Date: ____________________________________________________ L.N.: ____

Binary System

48 = 104 =

58 = 202 =

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 ______________ Two times a number, plus six is twelve.

2. (5) (6) − x = 25 ______________ Five times the difference of six and a number is twenty five.

3. 8(4 + 9) = 104 ______________ Eight times the sum of four and nine is one hundred four.

Solve.

1. If 2/3 of the pizza are left, what part will you and your two friends get?

2. There are 36 donuts in a box. Each donut is either chocolate or cinnamon. There are 6 fewer chocolate donuts than cinnamon. Let x be the number of cinnamon. Underline the correct expression.

a) x+x −6 =36 b) x+x(x−6)=36 c) x−6=36

3. My brother will be forty years old in forty years. Let b be the age of my brother now:

a) 40 −b =4 b) b+4 = 40 c) b−4 = 40

4. Donna got 84 in a quiz, which includes 5-point bonus. Let x be the grade she would have had without the bonus.

a) x −84 = 100 b) x − 5 = 100 c) x + 5 = 84

Write an equation.

1. I have to check 90 exams. I have checked 35. How many exams am I missing?

2. One trip is ¾ kms. If we decide to take 6 trips, how many kilometers are we going to travel?

3. 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?

Simplify the expressions.

1. −6(a+8) 3. 4(1+9x)

2. 6(−5n+7)

Write each as an algebraic expression.

1. The difference of 10 and 5

2. The quotient of 14 and 7

3. u decreased by 17

4. The product of x and 7

5. Twice q