Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 857 · 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 281 + 496 = 786 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 424 + 858 = 1280 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 78 = 1321 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 90 × 27 = 2430 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 591 + 846 = 1435 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 20 × 60 = 1200 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 25 × 24 = 600 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 73 × 97 = 7086 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 81 × 82 = 6642 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 179 + 382 = 568 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 70 × 86 = 6022 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 902 + 953 = 1855 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 96 × 40 = 3838 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 86 × 78 = 6700 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 66 × 48 = 3160 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 672 + 195 = 875 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 86 × 29 = 2491 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 703 + 375 = 1080 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 988 + 365 = 1354 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 221 + 942 = 1163 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 17 × 61 = 1035 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 64 × 93 = 5952 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 24 × 71 = 1703 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 87 = 1045 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 81 × 70 = 5670 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 646 + 666 = 1308 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 80 × 14 = 1120 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 57 × 30 = 1710 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 67 × 32 = 2142 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 27 × 25 = 682 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 343 + 419 = 762 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 31 × 42 = 1296 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 668 + 209 = 872 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 79 × 79 = 6240 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 248 + 549 = 796 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 510 + 303 = 808 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 48 × 26 = 1243 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 134 + 806 = 940 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 22 × 70 = 1540 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 23 × 21 = 483 right or wrong? (a) Right (b) Wrong

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