This document contains a math practice worksheet for a 3rd period exam at Colegio San Patricio. The worksheet includes problems on the binary system, number lines, equations, word problems, simplifying expressions, and writing algebraic expressions. It provides practice with various math concepts to help students prepare for their upcoming exam.

1. COLEGIO SAN PATRICIO
Math 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.

2. 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.

3. 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