Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 112 · 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 × 44 = 1760 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 877 + 371 = 1248 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 834 + 486 = 1320 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 51 × 31 = 1581 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 57 × 52 = 2964 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 92 × 83 = 7636 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 80 × 60 = 4800 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 27 × 49 = 1323 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 56 × 84 = 4704 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 813 + 502 = 1315 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 235 + 978 = 1212 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 97 × 36 = 3492 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 35 = 728 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 37 × 54 = 1998 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 196 + 358 = 554 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 15 × 66 = 985 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 948 + 597 = 1538 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 551 + 317 = 870 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 649 + 966 = 1614 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 22 = 2022 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 80 × 28 = 2240 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 12 × 15 = 179 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 565 + 491 = 1056 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 822 + 555 = 1368 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 59 × 30 = 1773 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 764 + 911 = 1676 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 367 + 526 = 893 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 54 × 52 = 2805 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 584 + 822 = 1406 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 956 + 789 = 1745 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 98 × 61 = 5978 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 45 × 43 = 1937 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 72 = 2808 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 798 + 911 = 1700 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 78 × 44 = 3432 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 333 + 201 = 534 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 624 + 235 = 859 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 84 × 75 = 6300 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 71 × 49 = 3485 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 374 + 934 = 1308 right or wrong? (a) Right (b) Wrong

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