Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 304 · 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 66 × 16 = 1056 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 74 × 61 = 4514 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 88 × 76 = 6688 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 27 × 41 = 1107 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 25 × 45 = 1125 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 984 + 538 = 1522 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 827 + 349 = 1176 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 550 + 238 = 789 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 921 + 480 = 1401 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 393 + 113 = 501 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 533 + 704 = 1237 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 43 × 29 = 1251 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 818 + 556 = 1368 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 491 + 578 = 1073 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 346 + 752 = 1095 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 58 × 46 = 2668 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 92 × 16 = 1472 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 980 + 349 = 1332 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 68 = 1904 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 22 × 21 = 462 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 990 + 156 = 1146 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 451 + 458 = 911 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 611 + 669 = 1289 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 882 + 839 = 1721 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 802 + 878 = 1687 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 60 × 85 = 5100 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 878 + 150 = 1034 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 557 + 621 = 1184 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 41 × 54 = 2207 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 44 × 28 = 1232 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 19 × 25 = 466 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 92 × 94 = 8648 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 34 × 54 = 1836 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 643 + 338 = 980 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 85 × 62 = 5270 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 59 = 885 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 15 × 60 = 900 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 61 = 4392 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 73 = 4161 right or wrong? (a) Right (b) Wrong

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