Adding and Subtracting Whole Numbers

Vocabulary

100

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

Commutative Property of Addition

200

The grouping of the addends does not change the sum

Associative Property of Addition

300

For any number, zero plus that number is the number

Identity Property of Addition

400

A symbol, usually a letter, that is used to represent an unknown quantity 

variable

500

A sentence that contains an equal sign (=), showing that two expressions are equal

Equation

Addition Properties and Subtraction Rules

100

35 - ____=35

0

200

(16+5) + ____= 16 + (5+10)

10

300

83 + 35 =  35 + ____

83

400

76 + 0 =

76

500

54 + (2 + 67) = (54 + ___) + 67

2

Patterns

100

Write each number.

10,000 more than 25,953

35,953

200

Write each number.

1,000 less than 63,035

62,035

300

Write each number.

1,000 less than 49,737

48,737

400

100,000 more than 53,502

153,502

500

100 less than 1,087

987

Estimate

100

Estimate. Round each number to the given place value.

1,454 + 335; hundreds

1,800

200

Estimate. Round each number to the given place value.

2,871 + 427; hundreds

3,300

300

Estimate. Round each number to the given place value.

$5,238 + $3,420; hundreds

$8,600

400

Estimate. Round each number to the given place value.

48,344 - 7,263; thousands

41,000

500

Estimate. Round each number to the given place value.

27,629 - 5,364; thousands

23,000