Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 967 · 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 59 × 55 = 3245 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 156 + 558 = 714 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 19 × 75 = 1425 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 673 + 234 = 907 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 767 + 723 = 1482 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 48 × 67 = 3216 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 883 + 172 = 1055 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 604 + 778 = 1382 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 56 × 34 = 1904 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 87 × 44 = 3828 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 33 × 38 = 1252 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 830 + 502 = 1332 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 13 × 94 = 1220 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 599 + 265 = 861 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 356 + 148 = 504 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 211 + 400 = 609 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 975 + 409 = 1384 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 31 × 74 = 2294 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 78 × 38 = 2968 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 22 = 1466 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 241 + 197 = 447 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 138 + 931 = 1060 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 57 × 69 = 3933 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 137 + 118 = 255 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 56 × 47 = 2623 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 45 × 68 = 3060 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 74 × 92 = 6808 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 983 + 625 = 1604 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 62 × 82 = 5084 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 248 + 322 = 570 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 44 = 1584 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 17 × 12 = 196 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 896 + 279 = 1175 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 539 + 251 = 790 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 64 × 63 = 4032 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 743 + 823 = 1566 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 616 + 890 = 1506 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 965 + 965 = 1925 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 965 + 689 = 1655 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 14 × 26 = 360 right or wrong? (a) Right (b) Wrong

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