Equations and Equalities

Vocabulary

100

Define variable

an unknown value that is represented by a letter; usually represented by x and y

200

Define constant

a number by itself

300

Define equation

a problem that includes expressions, terms, and both sides are equal

400

Define coefficient

the number that is being multiplied by the variable

500

Define term

it can be represented as a single number, a number and a variable, or numerous variables multiplied together

Vocabulary

100

Give an example of a constant

12

200

Give an example of an expression

12 or 12x or 12-x

300

Give an example of a term

8 or 8y

400

Define operator

an operation; addition, subtraction, multiplication or division

500

Define expression

can be a single number, a number and variable, or an expression containing an operator

Solve equations

100

10 + x = 14

x = 4

200

T - 12 = 6

T = 18

300

3x = 15

x = 5

400

2x = 4

x = 2

500

3+x = 20

x = 17

Solve Word Problems

100

Tim started with $15 for his lemonade stand.  He sold some lemonade and later had $35 total.  How much money did he make?

$20

200

Molly had some crayons. She gave her sister 8. Now she has 16.  How many did she start with?

24

300

I go to the store and buy 3 apples for .50 each.  How much did I spend on apples?

$1.50

400

Sally buys 5 cupcakes and spends $15.  How much was each cupcake?

$5

500

Jim goes to the store to buy 7 boxes of crackers.  Each box costs $4.  How much does he spend in all?

$28

Solve equations with given variables

100

2x =

x = 8

16

200

16x =

x = 2

32

300

4x - 2 = 

x = 3

10

400

x + y =

x = 1

y = 7

8

500

2x + 3 =

x = 1

5