Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 96 · 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 28 × 73 = 2040 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 927 + 864 = 1784 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 333 + 252 = 585 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 43 × 95 = 4079 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 26 × 15 = 390 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 75 × 20 = 1500 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 59 × 67 = 3946 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 63 × 19 = 1197 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 40 = 3003 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 27 = 317 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 55 × 95 = 5228 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 263 + 134 = 390 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 394 + 828 = 1222 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 590 + 242 = 835 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 62 × 17 = 1054 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 229 + 353 = 582 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 85 × 38 = 3230 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 121 + 146 = 267 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 89 = 1869 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 311 + 210 = 526 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 583 + 159 = 733 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 673 + 413 = 1086 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 50 × 35 = 1750 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 290 + 519 = 803 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 41 × 30 = 1235 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 57 × 32 = 1830 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 125 + 537 = 668 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 485 + 840 = 1321 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 14 × 74 = 1036 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 28 = 1624 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 69 × 18 = 1242 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 24 × 85 = 2040 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 197 + 645 = 842 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 378 + 787 = 1169 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 988 + 637 = 1633 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 28 × 58 = 1624 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 281 + 794 = 1075 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 867 + 418 = 1277 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 26 × 53 = 1378 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 95 × 27 = 2565 right or wrong? (a) Right (b) Wrong

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