Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 921 · 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 37 × 41 = 1525 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 155 + 560 = 715 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 40 × 97 = 3875 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 83 × 78 = 6474 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 16 × 51 = 820 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 94 × 62 = 5828 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 417 + 389 = 806 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 590 + 145 = 732 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 85 × 37 = 3145 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 537 + 591 = 1128 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 177 + 842 = 1019 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 420 + 584 = 1000 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 544 + 530 = 1074 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 512 + 326 = 833 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 939 + 167 = 1106 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 54 × 33 = 1782 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 176 + 345 = 514 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 86 × 47 = 4042 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 30 × 32 = 960 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 859 + 828 = 1688 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 112 + 920 = 1027 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 188 + 218 = 406 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 149 + 741 = 890 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 43 × 97 = 4179 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 80 × 39 = 3120 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 35 × 34 = 1190 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 15 = 255 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 272 + 931 = 1200 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 39 × 59 = 2292 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 29 × 16 = 467 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 88 × 87 = 7656 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 14 = 924 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 293 + 771 = 1064 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 226 + 802 = 1028 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 91 × 81 = 7371 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 367 + 197 = 564 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 88 × 72 = 6336 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 96 × 68 = 6528 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 15 × 18 = 265 right or wrong? (a) Wrong (b) Right

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