Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 233 · 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 18 × 62 = 1116 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 88 × 92 = 8096 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 234 + 328 = 560 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 248 + 225 = 473 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 820 + 207 = 1021 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 740 + 286 = 1026 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 544 + 771 = 1315 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 344 + 350 = 694 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 52 × 77 = 3996 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 87 × 17 = 1484 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 497 + 422 = 919 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 827 + 175 = 1002 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 867 + 136 = 1006 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 81 = 1377 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 853 + 152 = 1005 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 83 × 34 = 2822 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 622 + 878 = 1498 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 82 × 49 = 4009 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 94 × 41 = 3853 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 911 + 364 = 1275 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 788 + 340 = 1136 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 603 + 113 = 716 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 70 × 45 = 3143 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 685 + 580 = 1265 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 339 + 152 = 491 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 97 × 64 = 6208 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 878 + 784 = 1662 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 170 + 287 = 448 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 32 × 78 = 2498 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 99 × 98 = 9705 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 87 × 93 = 8091 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 76 × 40 = 3040 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 50 × 32 = 1600 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 246 + 156 = 402 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 311 + 382 = 693 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 81 × 18 = 1466 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 51 = 1733 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 323 + 642 = 965 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 38 × 38 = 1444 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 593 + 450 = 1043 right or wrong? (a) Right (b) Wrong

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