Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 36 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 60 × 30 = 1800 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 93 × 49 = 4557 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 282 + 331 = 613 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 48 × 33 = 1576 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 572 + 402 = 974 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 696 + 933 = 1629 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 335 + 188 = 517 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 419 + 154 = 573 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 49 × 49 = 2408 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 47 × 78 = 3666 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 13 × 22 = 286 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 62 × 72 = 4472 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 13 × 29 = 377 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 234 + 172 = 406 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 13 × 98 = 1274 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 55 × 14 = 770 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 85 × 75 = 6366 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 65 = 3835 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 17 × 67 = 1139 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 750 + 227 = 972 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 45 = 1395 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 131 + 140 = 270 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 23 × 93 = 2139 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 62 = 3658 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 49 × 16 = 784 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 89 × 89 = 7921 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 142 + 682 = 824 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 150 + 247 = 397 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 552 + 514 = 1066 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 33 × 89 = 2939 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 41 × 35 = 1435 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 21 × 27 = 559 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 737 + 519 = 1256 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 71 × 61 = 4331 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 245 + 236 = 481 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 47 × 97 = 4564 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 360 + 356 = 708 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 40 × 66 = 2632 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 867 + 821 = 1685 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 744 + 928 = 1679 right or wrong? (a) Right (b) Wrong

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