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Addition Properties and Subtraction Rules
Patterns
Addition
Estimation
100

3+5=3+5

Commutative Property

100

Fill in the blank and tell me the pattern. 8,901, 8,911, _______, 8,931

8,921. Add 10

100

61 + 15

76

100
2,781 + 427= _________ hundreds
What is 2,900 + 400 = 3,300
200

14+0=14

Identity Property

200

45, 311 + ___________ = 46,311

Add 1,000

200

48 + 370 =

418

200
48,344 - 7,263 =_________ thousands
What is 48,000 -7,000 = 41,000
300

22+0=22

Identity Property

300

84,522 + 10,000 = ___________

94,522

300

738 +56=

794

300
25,497 + 54,088 = __________ ten thousands
What is 30,000 + 50,000 = 80,000
400

(3+8)+6 and 3+(8+6)

Associative Property

400

George completed this number pattern. Find and correct the mistake. 27,389, 26,389, 25,389, 23,389, 22,389

He forgot to put 24,389 after 25, 389.

400

8,782 + 816

9,598

400
4,127 + 2,666 = ________ hundreds
What is 4,100 + 2,700 = 6,800
500

7+2=9 and 2+7=9

Commutative Property

500

Start with 272 and do the following steps. Add 1,000 more, 10 more, 10,000 more, and 1 more.

11,283.

500

4,671 + 1,366

6,037

500
Write an equation with two numbers that when rounded to the thousands place have an estimated sum of 10, 000.
What is 4, 749 and 5, 246.