Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 88 · 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 44 × 74 = 3256 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 145 + 813 = 958 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 393 + 814 = 1207 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 33 × 85 = 2805 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 85 × 20 = 1700 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 28 × 18 = 504 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 18 × 17 = 306 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 209 + 518 = 727 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 91 × 56 = 5089 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 26 × 14 = 364 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 95 × 78 = 7410 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 682 + 805 = 1478 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 436 + 151 = 587 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 37 × 57 = 2103 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 158 + 346 = 504 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 583 + 189 = 764 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 12 × 26 = 312 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 65 × 89 = 5785 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 303 + 242 = 545 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 779 + 506 = 1285 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 45 × 98 = 4415 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 55 × 62 = 3410 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 23 = 299 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 494 + 871 = 1363 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 98 × 90 = 8817 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 354 + 872 = 1225 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 543 + 225 = 762 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 98 × 72 = 7056 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 43 × 42 = 1806 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 141 + 476 = 617 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 66 × 88 = 5817 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 693 + 687 = 1389 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 40 × 37 = 1480 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 68 × 53 = 3608 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 659 + 522 = 1182 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 47 × 84 = 3948 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 872 + 933 = 1801 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 806 + 896 = 1695 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 97 × 83 = 8051 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 414 + 657 = 1067 right or wrong? (a) Right (b) Wrong

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