Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 778 · 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 16 × 43 = 688 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 26 × 30 = 780 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 550 + 715 = 1265 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 79 × 95 = 7505 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 59 × 90 = 5310 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 71 × 21 = 1491 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 518 + 749 = 1267 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 637 + 347 = 991 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 21 × 48 = 1008 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 639 + 885 = 1524 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 213 + 775 = 981 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 34 × 62 = 2108 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 491 + 397 = 889 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 97 × 79 = 7663 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 622 + 127 = 749 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 85 × 26 = 2202 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 21 × 65 = 1365 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 396 + 425 = 821 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 67 × 62 = 4148 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 418 + 659 = 1077 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 438 + 825 = 1263 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 766 + 978 = 1753 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 28 × 53 = 1484 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 456 + 925 = 1381 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 42 × 23 = 966 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 82 = 4756 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 808 + 143 = 960 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 55 = 5062 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 77 × 76 = 5852 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 51 = 1332 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 148 + 670 = 824 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 53 × 33 = 1749 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 66 × 37 = 2442 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 87 × 87 = 7575 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 24 × 70 = 1681 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 48 = 4512 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 19 × 94 = 1795 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 97 = 6985 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 60 × 21 = 1258 right or wrong? (a) Right (b) Wrong

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