Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 273 · 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 55 × 68 = 3740 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 226 + 263 = 489 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 26 × 95 = 2468 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 369 + 455 = 824 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 48 × 42 = 2016 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 70 × 28 = 1960 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 48 × 73 = 3504 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 198 + 928 = 1126 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 901 + 393 = 1291 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 65 = 1306 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 997 + 516 = 1508 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 300 + 821 = 1129 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 66 × 59 = 3894 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 624 + 966 = 1591 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 116 + 519 = 635 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 248 + 936 = 1184 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 34 × 46 = 1571 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 729 + 677 = 1406 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 584 + 281 = 865 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 28 × 84 = 2352 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 20 × 14 = 280 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 12 × 64 = 761 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 34 × 31 = 1045 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 89 × 71 = 6319 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 990 + 766 = 1756 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 405 + 703 = 1113 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 141 + 340 = 481 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 951 + 459 = 1410 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 52 × 81 = 4212 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 718 + 229 = 947 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 64 × 53 = 3392 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 36 = 765 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 108 + 382 = 490 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 51 × 13 = 663 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 284 + 224 = 508 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 79 × 53 = 4187 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 366 + 237 = 603 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 20 × 97 = 1940 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 175 + 456 = 631 right or wrong? (a) Right (b) Wrong

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