You can work out each sum in your head (best) or on paper.
Click this link to download and print out this exercise sheet. (Wait for a new Window to open)
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 |
◀ RETURN TO THE LESSON