Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 242 · 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 992 + 490 = 1482 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 60 × 57 = 3426 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 16 × 25 = 400 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 735 + 784 = 1517 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 523 + 517 = 1040 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 579 + 908 = 1494 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 87 × 16 = 1399 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 17 × 74 = 1260 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 77 × 31 = 2379 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 83 = 4644 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 99 × 37 = 3667 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 111 + 344 = 455 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 20 × 68 = 1358 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 674 + 203 = 873 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 91 × 43 = 3922 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 79 × 30 = 2370 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 74 × 12 = 888 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 76 × 29 = 2206 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 73 × 88 = 6416 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 80 × 32 = 2560 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 40 × 81 = 3247 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 789 + 400 = 1189 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 683 + 621 = 1296 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 95 × 99 = 9405 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 310 + 659 = 969 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 574 + 656 = 1239 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 39 × 98 = 3822 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 54 × 19 = 1018 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 13 × 51 = 663 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 95 × 54 = 5123 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 711 + 880 = 1591 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 937 + 371 = 1308 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 62 × 28 = 1736 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 908 + 603 = 1511 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 74 × 18 = 1333 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 31 × 60 = 1854 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 77 × 58 = 4472 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 96 × 52 = 5000 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 718 + 758 = 1476 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 95 × 63 = 5985 right or wrong? (a) Right (b) Wrong

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