Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 23 · 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 68 × 48 = 3264 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 366 + 698 = 1064 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 935 + 555 = 1490 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 394 + 646 = 1041 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 503 + 814 = 1317 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 720 + 334 = 1054 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 64 × 79 = 5061 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 669 + 720 = 1383 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 13 × 44 = 579 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 243 + 539 = 778 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 13 × 93 = 1208 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 51 × 19 = 969 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 928 + 308 = 1236 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 57 × 36 = 2052 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 715 + 651 = 1366 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 20 × 36 = 728 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 251 + 437 = 688 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 31 × 18 = 555 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 19 × 20 = 383 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 53 × 95 = 5035 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 793 + 941 = 1734 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 23 × 80 = 1840 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 85 × 77 = 6545 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 923 + 529 = 1451 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 52 × 33 = 1716 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 731 + 284 = 1015 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 67 × 51 = 3417 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 71 × 26 = 1846 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 62 × 95 = 5890 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 79 = 4575 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 60 × 25 = 1500 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 449 + 509 = 967 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 65 × 94 = 6113 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 368 + 719 = 1087 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 998 + 236 = 1234 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 287 + 825 = 1110 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 24 × 14 = 336 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 41 × 77 = 3165 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 452 + 369 = 828 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 286 + 875 = 1170 right or wrong? (a) Wrong (b) Right

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