Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 344 · 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 23 × 40 = 920 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 27 × 29 = 783 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 65 × 20 = 1300 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 667 + 741 = 1408 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 125 + 615 = 738 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 37 × 98 = 3626 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 338 + 254 = 585 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 661 + 340 = 1001 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 93 × 86 = 7998 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 43 × 35 = 1505 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 61 × 72 = 4391 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 46 × 19 = 865 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 17 × 71 = 1210 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 15 × 99 = 1485 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 249 + 547 = 794 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 668 + 543 = 1211 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 17 × 63 = 1064 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 869 + 715 = 1577 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 77 × 24 = 1848 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 628 + 830 = 1458 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 90 × 14 = 1260 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 43 × 91 = 3913 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 304 + 396 = 707 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 111 + 434 = 545 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 287 + 119 = 406 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 283 + 674 = 954 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 498 + 241 = 739 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 83 × 31 = 2577 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 733 + 239 = 966 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 367 + 135 = 502 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 836 + 202 = 1038 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 505 + 321 = 835 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 446 + 391 = 837 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 365 + 509 = 882 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 571 + 175 = 751 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 47 = 2209 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 59 × 99 = 5838 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 57 × 32 = 1830 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 68 × 86 = 5848 right or wrong? (a) Right (b) Wrong

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