Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 290 · 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 74 × 13 = 966 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 478 + 694 = 1178 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 168 + 653 = 821 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 81 × 90 = 7294 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 70 × 26 = 1820 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 28 = 560 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 98 × 15 = 1470 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 30 = 1462 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 968 + 451 = 1428 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 766 + 470 = 1233 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 594 + 173 = 767 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 12 × 88 = 1056 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 36 × 56 = 2016 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 95 × 28 = 2660 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 87 × 98 = 8528 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 59 × 50 = 2955 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 64 = 3965 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 53 = 689 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 722 + 389 = 1113 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 291 + 137 = 428 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 83 × 22 = 1826 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 817 + 226 = 1043 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 35 × 15 = 527 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 980 + 564 = 1535 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 305 + 993 = 1296 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 67 × 33 = 2211 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 140 + 189 = 328 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 263 + 949 = 1212 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 418 + 497 = 915 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 592 + 707 = 1291 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 57 × 21 = 1197 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 38 × 45 = 1710 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 32 × 61 = 1952 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 903 + 490 = 1393 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 41 × 27 = 1111 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 255 + 308 = 569 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 79 = 2923 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 32 = 376 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 851 + 570 = 1415 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 180 + 547 = 730 right or wrong? (a) Wrong (b) Right

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