Show:
Sums up to 100
Subtraction
Doubles + or - 1
Doubles Addition
Adding & Subtracting up to 1000
100

15 + 9 =

24

100

12 - 9 =

3

100

20-11

9

100

20 + 20 =

40

100

425 - 400 =

25

200

26 + 26 +26 =

78

200

20 - 7 =

13

200

30 - 16 =

14

200

50 + 50 =

100

200

425 - 399 =

26

300

23 + 41 + 7 =

71

300

40 - 18 = 

22

300

50-26 = 

24

300

250 + 250 =

500

300

700 - 259 =

441

400

8 + 8 + 8 + 10 + 10 + 10 + 20 =

84

400

500 - 256 =

244

400

25 +26 =

51

400

125 + 125 =

250

400

923 - 694

229

500

25 + 25 + 25 +10 + 10 + 1 + 1+ 1 + 1+ 1  =

100

500

1000 - 871

129

500

80 + 81 =

161

500

78 + 78 =

156

500

825 + 75 + 100 - 16 =

984