Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 72 · 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 320 + 907 = 1226 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 814 + 255 = 1069 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 35 × 47 = 1645 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 860 + 200 = 1060 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 420 + 634 = 1060 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 42 × 32 = 1344 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 202 + 486 = 688 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 18 × 32 = 576 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 690 + 320 = 1010 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 332 + 838 = 1170 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 93 × 70 = 6510 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 37 × 73 = 2698 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 23 × 39 = 904 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 36 × 57 = 2052 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 759 + 861 = 1620 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 864 + 340 = 1204 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 17 × 58 = 979 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 16 × 56 = 898 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 60 × 67 = 4020 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 26 × 75 = 1950 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 53 × 64 = 3392 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 25 × 14 = 350 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 70 × 52 = 3648 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 25 × 21 = 525 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 45 × 97 = 4365 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 25 = 608 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 58 = 3721 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 672 + 720 = 1393 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 63 × 23 = 1449 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 153 + 655 = 808 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 69 × 26 = 1794 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 35 × 96 = 3368 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 77 × 62 = 4774 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 666 + 302 = 968 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 36 × 68 = 2448 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 50 × 76 = 3800 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 952 + 413 = 1365 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 53 × 41 = 2178 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 411 + 588 = 999 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 531 + 229 = 763 right or wrong? (a) Right (b) Wrong

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