Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 243 · 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 57 × 24 = 1369 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 97 × 48 = 4653 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 29 × 14 = 406 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 63 × 31 = 1949 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 216 + 202 = 409 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 255 + 166 = 418 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 66 × 91 = 6006 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 62 × 34 = 2106 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 632 + 713 = 1339 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 283 + 321 = 604 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 60 × 16 = 960 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 90 × 76 = 6840 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 34 × 37 = 1257 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 30 × 63 = 1890 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 501 + 863 = 1364 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 44 = 1531 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 955 + 570 = 1525 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 55 = 1815 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 836 + 767 = 1603 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 670 + 107 = 778 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 99 × 16 = 1584 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 335 + 494 = 820 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 278 + 199 = 479 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 69 × 83 = 5731 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 31 × 49 = 1519 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 96 × 49 = 4704 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 604 + 322 = 924 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 866 + 624 = 1481 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 32 × 89 = 2845 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 459 + 345 = 804 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 464 + 497 = 961 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 36 = 720 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 614 + 966 = 1580 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 36 × 37 = 1332 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 134 + 145 = 279 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 33 × 62 = 2044 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 941 + 133 = 1074 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 765 + 591 = 1352 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 752 + 902 = 1653 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 135 + 138 = 273 right or wrong? (a) Wrong (b) Right

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