Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 128 · 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 888 + 749 = 1637 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 354 + 150 = 513 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 291 + 252 = 551 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 14 × 14 = 197 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 365 + 186 = 556 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 829 + 422 = 1248 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 96 = 7107 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 92 × 81 = 7452 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 46 × 70 = 3220 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 18 × 37 = 666 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 32 × 37 = 1184 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 456 + 603 = 1058 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 68 × 21 = 1428 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 93 × 51 = 4743 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 81 × 45 = 3642 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 40 × 36 = 1440 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 26 = 624 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 19 × 49 = 924 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 27 × 52 = 1404 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 60 × 27 = 1620 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 637 + 382 = 1017 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 145 + 757 = 895 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 727 + 344 = 1071 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 532 + 940 = 1464 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 21 × 45 = 947 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 930 + 467 = 1397 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 25 = 1648 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 328 + 649 = 977 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 97 × 68 = 6596 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 77 × 20 = 1540 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 15 × 12 = 180 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 34 × 30 = 1020 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 84 × 48 = 4032 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 38 × 87 = 3298 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 15 × 40 = 595 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 362 + 383 = 745 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 78 × 96 = 7489 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 925 + 258 = 1180 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 20 × 74 = 1480 right or wrong? (a) Wrong (b) Right

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