Chapter 2&3

Vocab

100

Mathematical sentence with an equal sign.

Equation

200

Numbers that are easy to divide mentally.

Compatible numbers

300

Term with no variable.

Constant

400

Open sentence

Equation with one or more variables.

500

Coefficient

Number with a variable (multiplies a variable)

Properties

100

a+11=11+a

Commutative property of addition

200

5(2x+3)= 5(2x) + 5(3)

Distributive property

300

x+0 = x

Identity property of addition

400

5y*1 = 5y

Identity property of mnultiplication

500

2(5y) = (2*5)y

Associative property of multiplication

Expressions

100

What are the coefficients?

8y +6ab +7 -3ab

8, 6, -3

200

What are the like terms?

8y + 6ab +7 -3ab

6ab, -3ab

300

What are the constants? 

4m +(-3n) +n

none

400

Simplify

2z+5z-3y+y

7z-2y

500

Simplify

6(2a-3b)

12a-18b

Equations

100

Solve

n-7.89=21.34

n=29.23

200

-x<2

x>-2

300

x/2 > -2

x>-6

400

m+3.6 = 10.3

m=6.7

500

Use the formula to solve

d=rt

r=17in/s

t=50s

d=850in

Rounding and Estimating

100

Round to the nearest hundredth.

462.356

462.36

200

Estimate using rounding

6.43-4.079

2

300

Estimate using clustering.

3.7 + 4.02 + 4.89 + 3.98

16

400

Estimate using compatible numbers.

12.89/3.04

4

500

Estimate using front-end.

2.06 + 3.91

6