Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 384 · 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 53 × 30 = 1594 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 50 = 4098 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 31 × 15 = 465 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 422 + 482 = 904 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 26 × 29 = 763 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 54 = 1134 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 29 × 60 = 1740 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 22 × 85 = 1877 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 34 × 29 = 980 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 596 + 609 = 1211 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 821 + 777 = 1601 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 283 + 413 = 696 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 64 × 85 = 5436 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 643 + 392 = 1035 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 286 + 429 = 715 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 668 + 853 = 1521 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 541 + 975 = 1521 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 45 × 45 = 2022 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 16 × 94 = 1506 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 24 × 62 = 1488 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 842 + 901 = 1743 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 711 + 264 = 978 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 41 × 50 = 2057 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 82 × 82 = 6724 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 569 + 413 = 982 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 254 + 603 = 857 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 226 + 805 = 1031 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 19 × 59 = 1126 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 389 + 738 = 1127 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 96 × 79 = 7584 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 734 + 338 = 1076 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 684 + 554 = 1238 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 615 + 507 = 1122 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 89 × 53 = 4717 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 50 × 77 = 3850 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 98 × 13 = 1272 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 94 × 81 = 7620 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 939 + 530 = 1475 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 655 + 511 = 1166 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 37 × 13 = 481 right or wrong? (a) Right (b) Wrong

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