Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 625 · 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 977 + 763 = 1740 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 34 = 680 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 98 × 86 = 8432 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 78 × 27 = 2099 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 20 × 17 = 340 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 410 + 929 = 1339 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 134 + 941 = 1072 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 32 × 34 = 1088 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 182 + 408 = 583 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 73 × 88 = 6424 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 192 + 507 = 696 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 116 + 964 = 1078 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 30 × 21 = 624 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 177 + 662 = 839 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 26 × 39 = 1014 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 401 + 633 = 1033 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 31 × 96 = 2976 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 494 + 656 = 1156 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 36 = 1008 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 43 = 3267 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 96 × 34 = 3260 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 26 = 468 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 69 × 58 = 4002 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 54 × 42 = 2265 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 65 × 57 = 3711 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 41 = 574 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 105 + 789 = 885 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 44 × 97 = 4268 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 81 × 88 = 7128 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 64 × 92 = 5888 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 869 + 159 = 1035 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 391 + 640 = 1030 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 50 × 68 = 3395 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 236 + 159 = 397 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 112 + 389 = 501 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 170 + 991 = 1161 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 145 + 632 = 775 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 18 × 22 = 396 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 84 × 53 = 4461 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 93 × 37 = 3443 right or wrong? (a) Right (b) Wrong

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