Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 439 · 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 80 × 86 = 6888 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 47 × 31 = 1457 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 99 × 13 = 1287 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 14 = 448 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 131 + 352 = 480 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 94 × 29 = 2726 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 618 + 687 = 1305 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 90 × 56 = 5039 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 99 × 62 = 6133 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 71 × 99 = 7036 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 317 + 380 = 697 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 621 + 772 = 1385 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 185 + 276 = 461 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 29 × 46 = 1334 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 71 × 80 = 5683 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 717 + 403 = 1112 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 55 = 5445 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 47 × 56 = 2632 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 67 × 50 = 3350 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 85 × 97 = 8237 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 425 + 444 = 869 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 35 × 89 = 3121 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 115 + 796 = 906 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 397 + 453 = 855 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 28 × 19 = 532 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 63 × 62 = 3901 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 336 + 831 = 1167 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 201 + 634 = 837 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 133 + 190 = 323 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 533 + 669 = 1202 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 931 + 776 = 1707 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 45 × 55 = 2475 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 14 × 51 = 712 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 21 × 79 = 1651 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 20 × 24 = 480 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 590 + 918 = 1502 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 871 + 326 = 1197 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 83 × 96 = 7972 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 55 = 1210 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 58 × 17 = 986 right or wrong? (a) Wrong (b) Right

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