Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 50 · 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 79 × 55 = 4345 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 89 × 22 = 1958 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 831 + 577 = 1408 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 757 + 448 = 1212 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 474 + 204 = 675 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 256 + 729 = 985 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 437 + 547 = 984 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 87 × 20 = 1740 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 574 + 395 = 975 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 19 = 1734 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 315 + 569 = 884 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 79 × 89 = 7029 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 54 × 72 = 3887 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 152 + 318 = 463 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 544 + 155 = 691 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 69 × 54 = 3726 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 33 × 59 = 1947 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 356 + 154 = 516 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 354 + 461 = 813 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 970 + 114 = 1084 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 47 = 3619 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 255 + 907 = 1165 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 16 × 43 = 686 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 328 + 802 = 1124 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 974 + 452 = 1433 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 772 + 661 = 1431 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 158 + 202 = 360 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 711 + 385 = 1099 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 672 + 805 = 1478 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 491 + 274 = 766 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 267 + 765 = 1024 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 84 × 12 = 1008 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 89 × 72 = 6408 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 704 + 559 = 1256 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 81 × 42 = 3398 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 52 × 83 = 4317 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 26 × 48 = 1256 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 599 + 746 = 1345 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 67 × 98 = 6566 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 304 + 341 = 643 right or wrong? (a) Right (b) Wrong

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