Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 412 · 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 853 + 486 = 1339 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 17 × 77 = 1313 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 686 + 596 = 1282 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 92 = 7461 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 86 × 48 = 4128 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 26 × 79 = 2054 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 66 × 56 = 3695 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 792 + 145 = 937 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 86 × 98 = 8435 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 75 × 95 = 7134 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 72 × 73 = 5256 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 504 + 209 = 709 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 610 + 952 = 1562 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 93 × 29 = 2697 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 15 × 86 = 1285 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 76 × 23 = 1752 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 80 × 45 = 3602 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 962 + 662 = 1628 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 876 + 151 = 1018 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 842 + 348 = 1185 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 700 + 846 = 1541 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 295 + 610 = 906 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 85 × 24 = 2040 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 893 + 448 = 1341 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 81 × 28 = 2271 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 380 + 723 = 1103 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 98 × 22 = 2149 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 93 × 52 = 4834 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 251 + 548 = 799 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 64 × 18 = 1152 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 78 × 52 = 4060 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 93 = 3162 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 550 + 798 = 1348 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 366 + 585 = 951 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 50 × 66 = 3291 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 53 × 14 = 746 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 876 + 794 = 1665 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 61 × 24 = 1464 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 81 × 97 = 7866 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 63 × 25 = 1575 right or wrong? (a) Right (b) Wrong

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