Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 90 · 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 525 + 167 = 686 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 65 × 57 = 3700 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 168 + 337 = 502 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 787 + 314 = 1101 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 41 = 1312 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 89 × 86 = 7654 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 189 + 937 = 1123 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 262 + 168 = 438 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 519 + 139 = 664 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 742 + 562 = 1300 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 560 + 763 = 1323 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 82 = 7544 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 13 = 1001 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 870 + 935 = 1812 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 74 × 61 = 4514 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 14 = 490 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 503 + 183 = 686 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 18 × 28 = 507 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 984 + 220 = 1211 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 83 × 21 = 1743 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 76 × 38 = 2888 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 27 = 861 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 52 × 13 = 676 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 29 × 72 = 2096 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 21 × 28 = 581 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 601 + 531 = 1132 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 40 × 15 = 600 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 666 + 979 = 1645 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 480 + 900 = 1389 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 119 + 833 = 959 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 65 × 73 = 4740 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 877 + 197 = 1073 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 82 × 35 = 2868 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 46 × 52 = 2392 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 50 = 4150 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 208 + 146 = 354 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 320 + 355 = 675 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 856 + 121 = 977 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 12 × 25 = 301 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 162 + 475 = 635 right or wrong? (a) Wrong (b) Right

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