Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 375 · 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 90 × 99 = 8919 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 213 + 186 = 399 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 232 + 701 = 937 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 926 + 463 = 1389 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 284 + 871 = 1155 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 26 × 63 = 1638 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 62 × 61 = 3779 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 15 = 885 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 63 × 75 = 4734 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 88 = 8008 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 831 + 687 = 1518 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 67 × 31 = 2077 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 76 × 47 = 3572 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 59 × 61 = 3601 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 22 × 53 = 1166 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 62 × 13 = 814 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 20 × 89 = 1783 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 97 × 85 = 8236 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 25 × 21 = 525 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 95 × 75 = 7125 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 78 × 89 = 6942 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 86 × 17 = 1462 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 913 + 966 = 1870 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 332 + 260 = 592 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 46 × 94 = 4323 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 124 + 966 = 1092 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 28 = 2716 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 68 × 47 = 3196 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 253 + 183 = 433 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 334 + 600 = 937 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 369 + 977 = 1348 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 265 + 118 = 383 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 28 × 33 = 926 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 72 = 2667 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 16 = 575 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 17 × 62 = 1054 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 861 + 630 = 1493 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 158 + 663 = 821 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 25 × 34 = 850 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 688 + 527 = 1211 right or wrong? (a) Wrong (b) Right

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