Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 59 · 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 142 + 822 = 966 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 604 + 276 = 878 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 534 + 358 = 888 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 138 + 118 = 262 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 17 × 91 = 1548 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 73 × 20 = 1460 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 89 × 40 = 3565 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 302 + 166 = 468 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 738 + 907 = 1644 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 89 × 75 = 6673 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 493 + 317 = 804 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 42 × 39 = 1645 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 251 + 134 = 387 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 50 × 85 = 4241 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 672 + 817 = 1489 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 91 × 48 = 4368 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 704 + 513 = 1223 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 105 + 284 = 388 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 463 + 486 = 949 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 89 × 99 = 8813 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 208 + 477 = 693 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 767 + 408 = 1175 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 14 × 53 = 750 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 42 × 55 = 2317 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 92 × 92 = 8468 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 481 + 510 = 999 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 45 = 3696 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 62 × 85 = 5269 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 125 + 274 = 399 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 565 + 750 = 1315 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 38 × 15 = 567 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 94 × 12 = 1128 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 74 × 24 = 1776 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 85 × 95 = 8074 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 263 + 851 = 1105 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 99 × 86 = 8514 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 699 + 272 = 966 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 66 = 1380 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 704 + 124 = 834 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 41 × 83 = 3403 right or wrong? (a) Right (b) Wrong

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