Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 310 · 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 930 + 164 = 1094 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 31 × 30 = 937 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 71 × 25 = 1766 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 358 + 188 = 555 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 27 × 66 = 1784 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 170 + 283 = 444 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 815 + 666 = 1490 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 357 + 444 = 801 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 81 × 36 = 2914 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 53 = 794 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 227 + 374 = 596 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 851 + 324 = 1175 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 535 + 451 = 986 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 410 + 509 = 919 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 327 + 782 = 1103 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 99 = 3472 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 557 + 645 = 1202 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 83 × 63 = 5224 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 78 × 77 = 6005 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 89 × 34 = 3024 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 383 + 620 = 1004 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 15 × 22 = 330 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 71 × 29 = 2059 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 67 × 78 = 5226 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 464 + 985 = 1449 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 28 × 94 = 2632 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 750 + 430 = 1180 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 86 = 1461 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 85 = 5857 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 224 + 251 = 476 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 983 + 139 = 1127 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 314 + 953 = 1267 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 108 + 608 = 716 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 26 × 25 = 650 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 272 + 666 = 930 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 46 × 23 = 1053 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 475 + 257 = 726 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 870 + 882 = 1758 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 49 × 51 = 2492 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 83 = 4726 right or wrong? (a) Wrong (b) Right

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