Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 916 · 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 345 + 489 = 834 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 487 + 867 = 1354 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 322 + 174 = 496 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 46 × 95 = 4364 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 54 × 25 = 1350 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 811 + 771 = 1582 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 39 = 3352 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 95 × 29 = 2758 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 34 × 81 = 2754 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 32 × 34 = 1088 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 743 + 672 = 1416 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 37 × 49 = 1820 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 436 + 676 = 1112 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 12 × 54 = 656 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 77 × 30 = 2307 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 905 + 939 = 1844 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 17 × 67 = 1147 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 43 × 13 = 559 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 199 + 929 = 1128 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 262 + 696 = 955 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 38 × 69 = 2613 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 81 × 28 = 2268 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 423 + 817 = 1237 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 38 × 64 = 2432 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 22 × 41 = 903 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 501 + 121 = 622 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 875 + 814 = 1689 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 299 + 433 = 732 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 724 + 375 = 1106 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 34 × 82 = 2782 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 362 + 447 = 809 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 789 + 330 = 1119 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 643 + 656 = 1299 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 149 + 920 = 1070 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 18 × 88 = 1584 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 87 = 5138 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 98 × 32 = 3127 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 94 × 96 = 9018 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 14 × 39 = 546 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 297 + 266 = 563 right or wrong? (a) Right (b) Wrong

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