Doubles plus...
Open number line and friendly numbers
Old school
Decomposing
Compensation
100

4 + 4 =

8

100

36 + 8 =

46

100

6 + 9 =

15

100

12 + 17 =

29

100

67 + 15 =

82

200

30 + 40 = 

70

200

49 + 23 =

72

200

88 + 35 =

123

200

34 + 52 =

86

200

56 + 75 = 

131

300

600 + 800 =

1,400

300

227 + 14 =

241

300

271 + 982 =

1253

300

219 + 222 =

441

300

334 + 369 =

703

400

2,200 + 2,400 =

4,600

400

398 + 499 =

897

400

7029 + 1344 =

8373

400

1578 + 131 =

1709

400

5728 + 1215

6943

500

60,000 + 80,000 =

140,000

500

2543 + 756 =

3299

500

78,543 + 61,920 =

140,460

500

23,941 + 45,166 =

69107

500

9606 + 3761 =

13367

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