Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 940 · 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 585 + 215 = 794 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 772 + 715 = 1478 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 61 × 77 = 4696 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 64 = 2240 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 452 + 934 = 1386 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 81 × 57 = 4614 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 336 + 134 = 470 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 298 + 793 = 1091 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 56 × 37 = 2073 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 23 = 1587 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 427 + 639 = 1066 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 89 × 50 = 4458 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 14 = 252 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 987 + 354 = 1341 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 91 × 67 = 6097 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 24 = 1103 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 65 × 21 = 1365 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 47 × 33 = 1551 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 94 × 73 = 6864 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 83 × 73 = 6059 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 90 × 44 = 3960 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 46 × 12 = 546 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 616 + 363 = 979 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 61 × 14 = 854 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 825 + 460 = 1286 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 28 = 756 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 693 + 845 = 1538 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 43 × 97 = 4168 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 36 × 80 = 2882 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 69 = 1173 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 894 + 834 = 1736 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 158 + 783 = 941 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 25 = 972 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 848 + 710 = 1558 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 356 + 282 = 637 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 721 + 873 = 1594 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 48 × 67 = 3212 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 55 × 31 = 1705 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 174 + 924 = 1105 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 66 × 48 = 3174 right or wrong? (a) Wrong (b) Right

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