Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 315 · 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 86 × 75 = 6458 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 28 × 71 = 1988 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 79 × 25 = 1975 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 523 + 413 = 936 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 57 × 81 = 4617 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 44 × 26 = 1144 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 248 + 706 = 963 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 56 × 78 = 4368 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 41 = 573 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 424 + 254 = 669 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 81 × 32 = 2592 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 75 × 61 = 4584 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 58 × 86 = 4990 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 247 + 497 = 748 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 12 = 280 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 87 × 74 = 6440 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 64 = 2360 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 39 × 18 = 711 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 524 + 946 = 1470 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 255 + 790 = 1045 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 262 + 168 = 428 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 14 × 32 = 448 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 753 + 400 = 1153 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 23 × 55 = 1265 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 480 + 448 = 937 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 931 + 894 = 1825 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 82 × 33 = 2706 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 12 × 24 = 287 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 358 + 376 = 737 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 94 × 40 = 3763 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 739 + 470 = 1209 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 619 + 115 = 737 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 53 × 45 = 2385 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 88 = 8360 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 891 + 626 = 1517 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 296 + 702 = 1000 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 89 × 73 = 6497 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 58 × 17 = 995 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 803 + 979 = 1782 right or wrong? (a) Wrong (b) Right

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