Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 986 · 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 17 × 59 = 1003 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 191 + 880 = 1067 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 84 × 52 = 4368 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 33 × 88 = 2904 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 93 × 22 = 2048 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 819 + 645 = 1464 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 94 × 73 = 6853 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 98 × 38 = 3724 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 71 × 25 = 1780 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 195 + 773 = 965 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 15 × 64 = 960 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 46 = 1196 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 93 × 22 = 2047 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 119 + 882 = 1002 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 162 + 642 = 802 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 185 + 968 = 1153 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 441 + 536 = 977 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 971 + 839 = 1802 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 60 × 78 = 4677 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 558 + 615 = 1170 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 17 × 74 = 1258 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 628 + 734 = 1359 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 29 × 59 = 1711 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 99 × 35 = 3465 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 92 × 60 = 5522 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 859 + 182 = 1032 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 22 × 93 = 2046 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 98 = 2744 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 53 × 33 = 1746 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 509 + 906 = 1415 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 767 + 607 = 1366 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 736 + 270 = 1006 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 51 = 3366 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 900 + 952 = 1845 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 97 × 43 = 4171 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 26 = 1511 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 75 × 27 = 2031 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 170 + 930 = 1100 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 44 × 83 = 3650 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 77 × 26 = 2002 right or wrong? (a) Right (b) Wrong

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