Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 3 · 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 806 + 911 = 1717 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 72 × 39 = 2808 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 64 × 27 = 1728 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 786 + 926 = 1716 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 932 + 422 = 1347 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 86 × 96 = 8256 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 47 × 97 = 4559 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 95 × 96 = 9120 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 901 + 986 = 1879 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 57 = 1133 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 59 × 15 = 885 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 17 × 12 = 199 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 391 + 542 = 936 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 30 × 64 = 1929 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 67 × 89 = 5963 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 922 + 837 = 1759 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 58 × 91 = 5278 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 98 × 63 = 6174 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 49 × 59 = 2891 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 90 × 76 = 6832 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 181 + 974 = 1150 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 27 × 19 = 517 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 24 × 52 = 1248 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 48 × 87 = 4185 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 16 × 94 = 1499 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 87 × 14 = 1227 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 319 + 390 = 708 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 83 × 88 = 7304 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 676 + 151 = 825 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 75 × 92 = 6900 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 34 × 61 = 2083 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 69 = 2346 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 63 × 63 = 3969 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 969 + 703 = 1672 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 22 = 2097 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 882 + 168 = 1050 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 313 + 747 = 1060 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 839 + 675 = 1513 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 836 + 639 = 1475 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 59 × 33 = 1947 right or wrong? (a) Wrong (b) Right

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