Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 994 · 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 61 × 69 = 4209 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 400 + 977 = 1377 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 21 × 58 = 1218 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 81 × 42 = 3402 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 700 + 554 = 1254 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 50 × 19 = 947 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 517 + 118 = 636 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 44 × 82 = 3605 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 702 + 805 = 1512 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 589 + 512 = 1101 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 94 × 56 = 5264 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 414 + 440 = 854 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 98 × 79 = 7742 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 30 × 84 = 2529 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 331 + 951 = 1274 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 12 × 77 = 924 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 265 + 105 = 370 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 31 = 1328 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 81 × 34 = 2746 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 299 + 714 = 1013 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 64 × 37 = 2368 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 177 + 856 = 1033 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 89 × 47 = 4181 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 203 + 576 = 778 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 308 + 172 = 480 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 214 + 140 = 354 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 43 × 92 = 3959 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 52 × 64 = 3319 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 281 + 958 = 1239 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 809 + 641 = 1450 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 99 × 30 = 2970 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 53 × 28 = 1484 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 41 × 87 = 3567 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 25 × 24 = 600 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 64 × 80 = 5120 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 35 = 2071 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 65 = 3640 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 57 × 66 = 3757 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 239 + 584 = 823 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 903 + 589 = 1492 right or wrong? (a) Right (b) Wrong

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