Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 977 · 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 91 × 30 = 2727 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 774 + 253 = 1035 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 16 × 84 = 1344 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 52 = 1925 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 71 × 19 = 1349 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 291 + 259 = 550 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 33 × 12 = 396 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 182 + 345 = 519 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 129 + 730 = 859 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 38 × 93 = 3534 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 887 + 699 = 1586 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 553 + 356 = 909 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 812 + 284 = 1096 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 405 + 227 = 640 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 299 + 108 = 404 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 163 + 730 = 890 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 69 × 12 = 828 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 20 × 92 = 1845 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 200 + 554 = 754 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 96 × 86 = 8264 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 362 + 214 = 576 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 39 × 61 = 2383 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 76 × 95 = 7213 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 55 × 50 = 2750 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 94 × 57 = 5355 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 70 × 21 = 1468 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 13 × 90 = 1170 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 312 + 440 = 752 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 790 + 549 = 1344 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 50 × 48 = 2407 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 33 × 32 = 1056 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 59 × 16 = 935 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 488 + 687 = 1175 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 745 + 729 = 1472 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 38 × 74 = 2812 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 574 + 809 = 1377 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 99 × 92 = 9106 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 403 + 854 = 1249 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 85 × 88 = 7480 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 56 × 21 = 1173 right or wrong? (a) Wrong (b) Right

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