Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 784 · 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 37 × 79 = 2923 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 22 × 35 = 770 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 333 + 722 = 1047 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 332 + 261 = 593 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 27 × 39 = 1049 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 40 × 57 = 2287 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 29 × 58 = 1682 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 86 × 95 = 8170 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 39 × 66 = 2580 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 239 + 498 = 732 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 24 × 53 = 1278 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 54 × 99 = 5346 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 71 × 75 = 5327 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 62 × 26 = 1612 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 21 × 83 = 1737 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 996 + 635 = 1631 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 376 + 124 = 494 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 683 + 328 = 1011 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 81 × 16 = 1296 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 47 = 803 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 24 × 89 = 2136 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 554 + 907 = 1455 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 69 × 35 = 2415 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 873 + 684 = 1557 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 647 + 944 = 1591 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 671 + 483 = 1155 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 22 × 45 = 983 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 14 × 20 = 280 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 41 × 48 = 1961 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 61 × 28 = 1707 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 26 × 81 = 2106 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 470 + 632 = 1102 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 166 + 461 = 627 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 594 + 398 = 1000 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 48 × 24 = 1149 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 198 + 341 = 541 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 177 + 274 = 451 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 81 × 81 = 6561 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 21 × 16 = 341 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 822 + 641 = 1463 right or wrong? (a) Wrong (b) Right

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