Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 159 · 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 120 + 227 = 349 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 83 × 59 = 4897 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 115 + 170 = 285 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 53 = 1702 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 59 × 24 = 1424 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 87 × 34 = 2966 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 58 × 64 = 3709 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 340 + 579 = 919 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 98 × 62 = 6076 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 96 = 8928 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 230 + 406 = 636 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 127 + 988 = 1118 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 37 × 52 = 1925 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 92 × 12 = 1104 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 44 × 13 = 580 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 24 × 57 = 1368 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 838 + 105 = 943 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 75 × 82 = 6144 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 835 + 468 = 1300 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 671 + 639 = 1311 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 45 × 31 = 1390 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 563 + 588 = 1150 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 754 + 507 = 1261 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 41 × 90 = 3688 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 52 = 4004 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 77 × 21 = 1617 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 86 × 26 = 2236 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 44 × 84 = 3699 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 202 + 397 = 599 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 85 = 4930 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 887 + 858 = 1751 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 90 × 17 = 1538 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 41 = 1772 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 18 × 19 = 347 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 32 × 31 = 992 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 211 + 297 = 510 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 23 × 93 = 2139 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 199 + 635 = 827 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 90 × 99 = 8909 right or wrong? (a) Right (b) Wrong

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