Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 596 · 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 56 × 49 = 2736 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 538 + 339 = 877 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 708 + 540 = 1249 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 40 = 3880 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 120 + 818 = 938 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 54 × 78 = 4205 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 61 × 79 = 4819 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 437 + 462 = 891 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 82 × 81 = 6642 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 511 + 206 = 719 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 28 × 40 = 1120 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 625 + 249 = 868 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 580 + 831 = 1410 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 77 × 46 = 3543 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 450 + 263 = 709 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 33 × 27 = 892 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 77 × 83 = 6386 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 54 × 24 = 1296 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 17 × 97 = 1656 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 50 × 21 = 1050 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 546 + 623 = 1169 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 74 × 71 = 5251 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 53 = 3121 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 558 + 611 = 1169 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 43 × 60 = 2580 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 429 + 140 = 570 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 527 + 108 = 641 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 654 + 863 = 1517 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 22 × 36 = 793 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 653 + 243 = 896 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 673 + 930 = 1606 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 293 + 763 = 1056 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 44 × 66 = 2904 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 84 × 29 = 2436 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 71 × 35 = 2485 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 14 × 31 = 434 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 60 × 60 = 3600 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 59 = 4248 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 542 + 155 = 696 right or wrong? (a) Wrong (b) Right

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