Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 445 · 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 452 + 645 = 1097 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 871 + 892 = 1757 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 555 + 209 = 768 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 99 × 92 = 9101 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 432 + 624 = 1056 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 24 × 22 = 537 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 70 × 93 = 6510 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 20 = 251 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 853 + 168 = 1021 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 174 + 340 = 514 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 42 × 96 = 4032 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 972 + 604 = 1576 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 50 × 95 = 4750 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 50 × 50 = 2500 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 61 × 74 = 4514 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 211 + 348 = 559 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 777 + 811 = 1590 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 289 + 719 = 1008 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 63 = 1828 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 250 + 418 = 668 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 221 + 665 = 886 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 62 × 69 = 4272 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 76 = 2659 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 93 × 66 = 6142 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 79 × 61 = 4822 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 270 + 360 = 630 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 20 × 61 = 1211 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 217 + 363 = 577 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 49 × 95 = 4655 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 33 × 44 = 1452 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 558 + 767 = 1331 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 809 + 402 = 1211 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 847 + 288 = 1140 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 107 + 684 = 791 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 117 + 631 = 746 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 96 × 92 = 8832 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 768 + 437 = 1214 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 44 = 3696 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 71 × 86 = 6106 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 118 + 660 = 784 right or wrong? (a) Right (b) Wrong

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