Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 205 · 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 81 × 30 = 2421 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 16 × 22 = 352 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 63 × 99 = 6237 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 84 × 51 = 4284 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 79 = 6483 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 82 × 61 = 5002 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 33 × 76 = 2508 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 657 + 500 = 1156 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 185 + 256 = 441 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 58 × 22 = 1272 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 27 × 56 = 1512 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 72 × 64 = 4613 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 35 × 28 = 980 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 91 × 35 = 3185 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 38 × 13 = 494 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 207 + 634 = 841 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 30 × 58 = 1748 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 30 × 98 = 2940 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 15 × 97 = 1463 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 255 + 472 = 728 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 62 × 42 = 2604 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 659 + 294 = 954 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 436 + 180 = 616 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 52 = 622 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 52 × 35 = 1823 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 317 + 468 = 785 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 25 × 99 = 2475 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 63 × 71 = 4469 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 17 × 70 = 1197 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 969 + 451 = 1416 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 912 + 938 = 1850 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 525 + 527 = 1052 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 27 × 49 = 1322 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 36 × 74 = 2661 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 696 + 478 = 1174 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 463 + 110 = 573 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 200 + 489 = 689 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 670 + 903 = 1573 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 257 + 540 = 800 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 567 + 404 = 963 right or wrong? (a) Wrong (b) Right

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