Adding Two and Three-Digit Numbers

Expanded Form

100

43 in expanded form

40 + 3

200

15 + 63

15 = 10 + 5 

63 = 60 + 3 

        70 + 8 = 78

300

13 + 25

13 = 10 + 3

25 = 20 + 5

        30 + 8 = 38

400

43 + 32

43 = 40 + 3

32 = 30 + 2

        70 + 5 = 75

500

51 + 46

51 = 50 + 1

46 = 40 + 6

        90 + 7 = 97

Base-ten Blocks

100

The number of tens in 64. 

6

200

64 + 27

91

300

34 + 19

53

400

78 + 17

95

500

177 + 286

463

Rename and Carry

100

26 + 37

63

200

35 + 28 

63

300

284 + 685

969

400

158 + 424

582

500

553 + 385

938

Basic Addition Facts

100

3 + 2

5

200

5 + 4

9

300

8 + 2

10

400

3 + 9

12

500

5 + 6

11

Doubles Facts

100

2 + 2

4

200

4 + 4

8

300

5 + 5 

10

400

10 + 10

20

500

30 + 30 

60