Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 468 · 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 336 + 575 = 911 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 30 × 81 = 2429 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 298 + 224 = 522 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 48 × 34 = 1625 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 65 × 37 = 2405 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 521 + 348 = 869 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 28 × 57 = 1587 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 121 + 377 = 497 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 135 + 197 = 332 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 39 × 40 = 1565 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 23 = 1916 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 907 + 326 = 1240 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 84 × 78 = 6552 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 510 + 503 = 1022 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 26 × 85 = 2210 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 90 × 72 = 6489 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 653 + 333 = 980 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 953 + 268 = 1221 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 42 × 80 = 3360 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 930 + 494 = 1424 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 205 + 645 = 850 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 50 × 83 = 4146 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 79 × 87 = 6864 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 644 + 677 = 1321 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 64 = 4920 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 31 × 95 = 2953 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 89 × 85 = 7565 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 66 × 29 = 1914 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 631 + 164 = 795 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 855 + 341 = 1202 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 96 × 45 = 4325 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 87 × 28 = 2436 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 549 + 175 = 731 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 37 × 58 = 2152 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 35 × 88 = 3080 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 792 + 247 = 1039 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 75 × 15 = 1121 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 613 + 836 = 1448 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 56 × 68 = 3807 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 59 × 40 = 2353 right or wrong? (a) Right (b) Wrong

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