Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 343 · 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 406 + 230 = 636 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 578 + 390 = 968 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 15 = 563 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 18 × 91 = 1646 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 918 + 277 = 1195 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 773 + 513 = 1286 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 115 + 972 = 1081 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 35 × 72 = 2521 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 649 + 912 = 1561 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 95 × 14 = 1328 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 561 + 282 = 843 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 32 × 49 = 1568 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 897 + 554 = 1451 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 47 × 37 = 1730 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 62 × 40 = 2481 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 19 × 66 = 1254 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 43 × 36 = 1548 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 99 × 19 = 1882 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 184 + 767 = 955 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 640 + 463 = 1103 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 57 × 42 = 2394 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 637 + 474 = 1111 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 744 + 674 = 1418 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 78 × 51 = 3978 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 606 + 723 = 1323 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 36 = 1879 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 798 + 120 = 918 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 95 × 56 = 5322 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 56 = 4928 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 186 + 655 = 833 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 34 × 53 = 1804 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 89 × 42 = 3747 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 17 × 84 = 1428 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 405 + 773 = 1183 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 28 × 36 = 1008 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 610 + 894 = 1500 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 59 × 47 = 2780 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 63 × 69 = 4349 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 71 × 63 = 4473 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 278 + 999 = 1277 right or wrong? (a) Right (b) Wrong

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