Show:
Basic Addition
Hard Addition
Basic Subtraction
Hard Subtraction
100

1+2

3

100

25+75

100

100

15-8

7

100

82-79

3

200

5+5

10

200

48+55

103

200

20-13

7

200

100-36

64

300

4+5

9

300

99+46

145

300

10-6

4

300

145-28

117

400

7+8

15

400

1500+2500

4000

400

54-9

45

400

300-142

158

500

11+11

22

500

3478+245

3723

500

42-7

36

500

1000-347

653

600

10+13

23

600

2689+4500

7189

600

103-98

5

600

1250-500

750