Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 747 · 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 89 × 18 = 1602 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 81 × 35 = 2829 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 994 + 961 = 1955 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 205 + 929 = 1129 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 222 + 297 = 510 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 291 + 251 = 542 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 856 + 743 = 1599 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 157 + 111 = 277 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 924 + 448 = 1372 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 440 + 793 = 1233 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 894 + 121 = 1015 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 53 = 4876 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 738 + 940 = 1672 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 216 + 804 = 1017 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 71 × 27 = 1919 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 870 + 655 = 1518 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 905 + 661 = 1566 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 463 + 576 = 1048 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 650 + 629 = 1279 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 586 + 197 = 783 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 25 × 99 = 2475 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 37 × 46 = 1700 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 80 = 2967 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 63 × 28 = 1764 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 68 × 93 = 6324 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 58 × 77 = 4472 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 59 × 98 = 5782 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 91 × 93 = 8463 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 472 + 839 = 1311 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 336 + 151 = 493 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 275 + 859 = 1134 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 88 = 2196 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 51 × 32 = 1632 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 22 × 74 = 1625 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 69 × 20 = 1379 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 930 + 987 = 1917 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 21 × 73 = 1533 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 163 + 179 = 342 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 518 + 512 = 1030 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 33 × 24 = 792 right or wrong? (a) Right (b) Wrong

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