Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 309 · 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 40 × 34 = 1365 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 204 + 698 = 902 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 492 + 381 = 873 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 68 × 83 = 5644 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 588 + 761 = 1348 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 23 × 68 = 1564 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 36 × 90 = 3240 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 86 × 13 = 1117 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 192 + 966 = 1158 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 705 + 364 = 1069 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 172 + 159 = 324 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 33 × 89 = 2931 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 860 + 200 = 1063 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 123 + 446 = 569 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 631 + 619 = 1246 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 975 + 129 = 1106 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 308 + 128 = 436 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 49 = 1322 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 618 + 290 = 908 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 83 × 44 = 3652 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 389 + 222 = 611 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 99 = 7219 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 22 × 48 = 1049 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 40 = 2560 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 585 + 126 = 712 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 40 × 27 = 1080 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 507 + 752 = 1259 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 485 + 760 = 1245 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 59 × 97 = 5721 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 914 + 327 = 1235 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 287 + 346 = 633 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 54 × 26 = 1404 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 468 + 150 = 618 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 247 + 444 = 698 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 62 × 96 = 5952 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 242 + 451 = 684 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 27 = 1269 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 20 × 14 = 280 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 256 + 161 = 417 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 611 + 143 = 752 right or wrong? (a) Right (b) Wrong

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