Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 20 · 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 153 + 218 = 379 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 19 = 532 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 315 + 215 = 532 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 886 + 546 = 1425 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 794 + 232 = 1024 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 766 + 759 = 1525 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 106 + 135 = 241 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 280 + 896 = 1176 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 31 × 57 = 1767 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 34 × 61 = 2072 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 613 + 188 = 801 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 83 = 7636 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 540 + 781 = 1321 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 153 + 171 = 324 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 51 × 36 = 1836 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 526 + 230 = 747 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 43 × 63 = 2707 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 61 × 28 = 1708 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 625 + 200 = 825 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 95 × 85 = 8075 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 435 + 300 = 731 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 472 + 833 = 1304 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 14 × 17 = 233 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 785 + 438 = 1216 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 41 = 739 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 869 + 118 = 987 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 42 × 88 = 3689 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 673 + 460 = 1133 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 386 + 782 = 1168 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 525 + 225 = 750 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 47 × 30 = 1410 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 15 × 65 = 980 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 70 = 1470 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 560 + 854 = 1414 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 47 × 27 = 1269 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 68 × 57 = 3876 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 368 + 964 = 1337 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 848 + 996 = 1844 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 98 × 74 = 7252 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 18 = 783 right or wrong? (a) Wrong (b) Right

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