6th Grade Algebra

Writing Expressions

100

Sixteen birds are flying south for the Winter. Some of them decide to leave.

16 - x

200

There are 600 students at a school. The principal wants to group them into several classes. 

600/x

300

My mom is X years old. I am 21 years younger than she is. 

x - 21

400

The difference of a number and 12 multiplied by 6.

6(x - 12)

500

At the local animal shelter, there are some cats and twice as many dogs. Write an expression to represent the total number of animals at the shelter?

x + 2x  or  2x + x

Substitution

100

x - 7 when x=23

16

200

3a - b when a=4 and b=6

6

300

bc + 5   when b=2 and c= 8

21

400

5(6 + z) when z=19

125

500

8/t + t²    when t= 4

18

Add/Subtract Equations

100

y - 21 = 18

y=39

200

x + 60 = 180

x=120

300

2 = x - 38

x=40

400

122 = p + 82

p=40

500

Ms. Brace withdrew $225 from her bank account. After the withdrawl, there was $548. How much money did Ms. Brace have before her withdrawl?

$773

Multiply/Divide Equations

100

3x = 12

x=4

200

28 = 4s

s=7

300

c/28 = 3

c=84

400

12 = b/3

b=36

500

x/3.2 = 4.5

x=14.4

Potpourri

100

What is the sum of 1,289 and 286?

1,575

200

What is the difference of 2,978 and 182?

2,796

300

What is the product of 12 and 14?

168

400

What is the quotient of 84 and 3?

28

500

What is 18 times the sum of 20 and 18?

684