Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 745 · 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 175 + 856 = 1028 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 743 + 330 = 1064 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 77 × 57 = 4393 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 999 + 443 = 1441 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 159 + 532 = 692 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 916 + 702 = 1618 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 211 + 125 = 341 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 74 × 85 = 6297 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 61 × 79 = 4819 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 281 + 254 = 535 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 402 + 688 = 1090 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 86 = 6708 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 33 = 2079 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 31 × 75 = 2325 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 57 × 33 = 1881 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 410 + 629 = 1039 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 31 = 682 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 73 × 58 = 4236 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 68 × 74 = 5032 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 231 + 297 = 528 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 910 + 691 = 1601 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 85 × 14 = 1190 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 827 + 786 = 1619 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 57 × 69 = 3933 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 246 + 356 = 602 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 560 + 383 = 945 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 908 + 760 = 1668 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 79 × 26 = 2051 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 322 + 643 = 965 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 63 × 54 = 3402 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 70 × 28 = 1952 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 354 + 304 = 658 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 40 = 3712 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 17 × 57 = 969 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 28 × 39 = 1092 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 849 + 318 = 1167 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 72 × 67 = 4824 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 13 × 40 = 521 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 446 + 843 = 1289 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 209 + 729 = 938 right or wrong? (a) Right (b) Wrong

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