You can work out each sum in your head (best) or on paper.
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Tap or click the answer-line of any sum and the keyboard will show. You can enter your answer and it will be instantly checked.
Group A
| (1) |
|
|
7 |
8 |
5 |
4 |
|
| |
|
− |
4 |
5 |
2 |
4 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 3330 |
| (2) |
|
|
9 |
8 |
5 |
2 |
|
| |
|
− |
2 |
4 |
5 |
1 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 7401 |
| (3) |
|
|
6 |
8 |
7 |
5 |
|
| |
|
− |
|
8 |
7 |
5 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 6000 |
| (4) |
|
|
3 |
4 |
5 |
6 |
|
| |
|
− |
1 |
3 |
5 |
6 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 2100 |
| (5) |
|
|
5 |
7 |
8 |
9 |
|
| |
|
− |
4 |
5 |
4 |
5 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 1244 |
| (6) |
|
|
9 |
6 |
8 |
5 |
|
| |
|
− |
3 |
3 |
3 |
3 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 6352 |
| (7) |
|
|
9 |
8 |
6 |
7 |
|
| |
|
− |
5 |
4 |
4 |
9 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 4418 |
| (8) |
|
|
6 |
2 |
4 |
1 |
|
| |
|
− |
5 |
1 |
2 |
8 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 1113 |
| (9) |
|
|
9 |
8 |
2 |
3 |
|
| |
|
− |
3 |
5 |
1 |
7 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 6306 |
| (10) |
|
|
7 |
5 |
8 |
4 |
|
| |
|
− |
3 |
2 |
1 |
8 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 4366 |
| (11) |
|
|
4 |
5 |
0 |
0 |
|
| |
|
− |
3 |
6 |
0 |
0 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 900 |
| (12) |
|
|
7 |
7 |
7 |
7 |
|
| |
|
− |
4 |
5 |
6 |
9 |
|
| |
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 3208 |
Group B
| (1) |
|
|
1 |
3 |
4 |
8 |
5 |
|
| |
|
− |
|
2 |
2 |
4 |
1 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 11244 |
| (2) |
|
|
3 |
5 |
8 |
7 |
4 |
|
| |
|
− |
1 |
3 |
4 |
5 |
1 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 22423 |
| (3) |
|
|
9 |
8 |
7 |
5 |
6 |
|
| |
|
− |
7 |
5 |
4 |
3 |
5 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 23321 |
| (4) |
|
|
8 |
7 |
3 |
5 |
4 |
|
| |
|
− |
3 |
4 |
0 |
2 |
1 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 53333 |
| (5) |
|
|
7 |
5 |
5 |
4 |
5 |
|
| |
|
− |
6 |
2 |
0 |
0 |
1 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 13544 |
| (6) |
|
|
9 |
8 |
7 |
5 |
4 |
|
| |
|
− |
4 |
5 |
2 |
4 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 53506 |
| (7) |
|
|
7 |
4 |
5 |
2 |
0 |
|
| |
|
− |
1 |
2 |
4 |
0 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 62112 |
| (8) |
|
|
5 |
8 |
7 |
4 |
5 |
|
| |
|
− |
4 |
5 |
2 |
0 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 13537 |
| (9) |
|
|
4 |
8 |
2 |
5 |
6 |
|
| |
|
− |
2 |
4 |
8 |
7 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 23378 |
| (10) |
|
|
3 |
1 |
2 |
2 |
4 |
|
| |
|
− |
1 |
2 |
5 |
4 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 18676 |
| (11) |
|
|
9 |
0 |
0 |
0 |
1 |
|
| |
|
− |
2 |
5 |
5 |
6 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 64433 |
| (12) |
|
|
7 |
0 |
2 |
0 |
0 |
|
| |
|
− |
2 |
4 |
5 |
8 |
5 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 45615 |
Group C
| (1) |
|
|
1 |
3 |
5 |
4 |
5 |
|
| |
|
− |
|
2 |
9 |
9 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 10547 |
| (2) |
|
|
|
4 |
0 |
0 |
0 |
|
| |
|
− |
|
1 |
9 |
8 |
7 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 2013 |
| (3) |
|
|
7 |
8 |
4 |
5 |
2 |
|
| |
|
− |
|
|
9 |
9 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 77453 |
| (4) |
|
|
3 |
5 |
4 |
8 |
8 |
|
| |
|
− |
1 |
9 |
8 |
9 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 15589 |
| (5) |
|
|
2 |
4 |
7 |
5 |
6 |
|
| |
|
− |
|
3 |
8 |
6 |
7 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 20889 |
| (6) |
|
|
6 |
0 |
0 |
0 |
0 |
|
| |
|
− |
4 |
9 |
9 |
9 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 10001 |
| (7) |
|
|
5 |
4 |
5 |
2 |
3 |
|
| |
|
− |
|
|
2 |
8 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 54234 |
| (8) |
|
|
9 |
2 |
2 |
2 |
2 |
|
| |
|
− |
2 |
9 |
9 |
9 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 62223 |
| (9) |
|
|
4 |
5 |
2 |
3 |
1 |
|
| |
|
− |
2 |
4 |
5 |
5 |
6 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 20675 |
| (10) |
|
|
9 |
8 |
5 |
2 |
0 |
|
| |
|
− |
1 |
2 |
9 |
8 |
8 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 95532 |
| (11) |
|
|
9 |
0 |
0 |
0 |
0 |
|
| |
|
− |
7 |
9 |
9 |
9 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 100001 |
| (12) |
|
|
8 |
8 |
7 |
7 |
5 |
|
| |
|
− |
4 |
4 |
8 |
8 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 43886 |
| (13) |
|
|
3 |
2 |
1 |
4 |
1 |
|
| |
|
− |
|
8 |
7 |
5 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 23382 |
| (14) |
|
|
2 |
1 |
3 |
5 |
4 |
|
| |
|
− |
|
9 |
9 |
8 |
7 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 11367 |
| (15) |
|
|
3 |
0 |
0 |
1 |
0 |
|
| |
|
− |
1 |
7 |
7 |
8 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 12221 |
| (16) |
|
|
9 |
8 |
7 |
6 |
5 |
|
| |
|
− |
2 |
9 |
8 |
7 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 68886 |
| (17) |
|
|
8 |
7 |
5 |
6 |
7 |
|
| |
|
− |
7 |
8 |
6 |
7 |
9 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
✓✕ |
| 8888 |
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