Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 46 · 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 87 × 89 = 7745 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 114 + 983 = 1089 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 23 × 68 = 1564 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 70 × 30 = 2100 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 12 = 174 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 912 + 671 = 1577 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 841 + 174 = 1016 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 528 + 901 = 1429 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 47 × 19 = 893 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 68 × 83 = 5636 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 28 × 26 = 725 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 93 = 7256 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 135 + 306 = 435 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 548 + 301 = 842 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 61 × 88 = 5368 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 55 × 13 = 714 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 44 × 72 = 3164 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 66 × 37 = 2439 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 281 + 800 = 1089 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 830 + 283 = 1120 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 888 + 134 = 1015 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 19 × 62 = 1178 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 296 + 664 = 960 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 903 + 323 = 1226 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 40 = 725 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 710 + 727 = 1440 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 227 + 178 = 405 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 159 + 928 = 1094 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 973 + 199 = 1178 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 599 + 709 = 1308 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 589 + 938 = 1527 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 92 × 52 = 4784 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 669 + 943 = 1605 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 71 × 27 = 1919 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 84 × 68 = 5716 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 196 + 563 = 759 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 46 × 47 = 2157 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 362 + 718 = 1080 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 69 = 2074 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 76 × 50 = 3793 right or wrong? (a) Right (b) Wrong

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