Vocabulary
Adding Decimals
Estimate then Add/Subtract
Properties of Addition
Rounding
100

Define: Commutative Property of Addition

The order in which numbers are added does not change the sum.

100

4.67 + 1.70

6.37

100

Round then add

32.9 + 17.2

50

100

This property always has parenthesis

Associative Property of Addition


100

Round 13.3 to the nearest one.

13

200

Identity Property

The sum of any number and 0 equals the number.


200

25.39 + 18.68

44.07

200

Round then subtract

48.21 - 12.64

35

200

What property is being used?

6 + 0 = 6

Identity


200

Round 14.56 to the nearest one.

15


300

Associative Property of Addition

The way in which numbers are grouped does not change the sum.


300

68.9 + 7.1

76

300

Round then add

7.91 + 21.9

30

300

What property is being used?

23 + 3 + 7 = 3 + 23 + 7

Commutative

300

Round 12.324 to the nearest hundredth.

12.32

400

What are the three decimal places in order starting right after the decimal?

Tenths, Hundredth, Thousandths

400

3.15 + 1.2

4.35

400

What property is being used?

12 + 8 + 13 + 7 = (12+8) + (13+7)

Associative

400

Round 0.089 to the nearest tenth.

0.1

500

Define the word Sum

The answer to an addition problem

500

0.7 + 0.33

1.03

500

Francis earned the following scores on his math quizzes: 86, 84, 90. Jillian earned the following scores on her math quizzes: 84, 90, 86. Who earned the greater total score?

What addition property would be helpful when finding the answer. 

The commutative property

500

Round 9.999 to the nearest hundredth.

10