Show:
Add & Subtract Within 20
2-Digit Addition
2-Digit Subtraction
3-Digit Addition
3-Digit Subtraction
100

9+6

15

100

57+10=

67

100

79-24=

55

100

167+33=

200

100

145-33=

112

200

20-___= 13

7

200

65+13=

78

200

82-10=

72

200

134+260=

394

200

287-164=

123

300

12+7=

19

300

47+36=

83

300

81-46=

35

300

520+110=

630

300

599-236=

363

400

18-4=

14

400

27+59=

86

400

94-35=

59

400

457+198=

655

400

318-125=

193

500

11+____=20

9

500

45+65=

110

500

76-28=

48

500

173+109=

282

500

200-97=

103