Ch. 2 Add & Subtract Whole Numbers

Properties of Addition

100

Name the Property of Addition: Commutative, Associative, or Identity.

8 + 0 = 8

Identity Property of Addition

200

Name the Property of Addition: Commutative, Associative, or Identity.

9 + 5 = 5 + 9

Commutative Property of Addition

300

Name the Property of Addition: Commutative, Associative, or Identity.

(5 + 2) + 8 = 5 + (2 + 8)

Associative Property of Addition

400

Add. 

  987,456

+ 48,672

1,036,128

500

Add.

    5,987,346

+  8,667,249

14,654,595

Subtract Across Zeros

100

   5,006

-  3,278

1,728

200

    10,907

-     8,789

2,118

300

  87,006

- 79,348

7,658

400

    605,030

-   498,757

106,273

500

   8,005,070

-  6,769,382

1,235,688

Estimating Sums

100

Round to the nearest ten to estimate the sum of:

8,784 + 4,567

8,780 + 4,570 = 13,350

200

Round to the nearest ten to estimate the difference of:

9,645 - 7,694

9,650 - 7,690 = 1,960

300

Round to the nearest hundred to estimate the sum of:

56,789 + 43,654

56,800 + 43,700 = 100,500

400

Round to the nearest hundred to estimate the difference of:

84,981 - 65,379

85,000 - 65,400 = 19,600

500

Round to the nearest thousand to estimate the difference of:

5,748,654 - 3,299,746

5,749,000 - 3,300,000 = 2,449,000