Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 275 · 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 20 × 91 = 1814 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 35 × 45 = 1575 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 226 + 237 = 464 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 784 + 459 = 1237 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 34 × 79 = 2686 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 705 + 671 = 1376 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 502 + 277 = 779 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 96 × 51 = 4896 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 70 = 1334 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 509 + 885 = 1394 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 330 + 845 = 1175 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 47 × 21 = 987 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 601 + 916 = 1509 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 954 + 974 = 1928 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 24 × 31 = 744 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 822 + 501 = 1325 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 31 × 50 = 1558 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 89 × 59 = 5251 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 968 + 379 = 1347 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 19 × 71 = 1354 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 943 + 542 = 1485 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 93 × 23 = 2139 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 952 + 544 = 1496 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 83 × 65 = 5394 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 648 + 652 = 1300 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 18 × 17 = 306 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 23 × 16 = 368 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 18 × 57 = 1024 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 118 + 516 = 634 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 816 + 483 = 1294 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 30 × 98 = 2938 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 47 × 57 = 2679 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 905 + 993 = 1898 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 53 × 21 = 1113 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 57 × 74 = 4218 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 52 × 89 = 4628 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 82 × 84 = 6888 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 865 + 627 = 1490 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 99 × 67 = 6633 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 647 + 374 = 1021 right or wrong? (a) Wrong (b) Right

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