Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 190 · 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 940 + 724 = 1664 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 233 + 854 = 1087 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 13 × 81 = 1056 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 259 + 106 = 365 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 235 + 807 = 1042 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 97 × 68 = 6596 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 93 × 48 = 4464 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 700 + 499 = 1204 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 78 × 43 = 3358 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 530 + 292 = 818 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 13 × 59 = 767 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 210 + 679 = 889 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 39 × 81 = 3152 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 494 + 585 = 1085 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 14 × 78 = 1093 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 915 + 792 = 1707 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 57 = 1371 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 48 = 2832 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 555 + 163 = 718 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 51 × 70 = 3567 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 50 × 69 = 3447 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 634 + 208 = 842 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 21 × 54 = 1134 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 76 × 68 = 5172 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 74 × 58 = 4292 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 51 × 29 = 1479 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 41 × 41 = 1681 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 42 × 79 = 3318 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 23 × 71 = 1633 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 69 × 49 = 3381 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 394 + 119 = 513 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 41 × 56 = 2291 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 14 × 65 = 910 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 759 + 762 = 1529 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 311 + 800 = 1102 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 33 = 1120 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 93 × 44 = 4092 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 886 + 585 = 1462 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 196 + 978 = 1174 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 479 + 903 = 1382 right or wrong? (a) Wrong (b) Right

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