Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 910 · 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 946 + 437 = 1385 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 601 + 764 = 1365 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 61 × 99 = 6037 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 91 × 42 = 3813 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 29 × 55 = 1595 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 652 + 986 = 1632 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 21 × 64 = 1344 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 156 + 555 = 711 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 225 + 755 = 980 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 307 + 896 = 1203 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 804 + 420 = 1221 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 17 × 15 = 252 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 321 + 504 = 826 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 80 = 3527 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 62 × 28 = 1736 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 90 × 12 = 1081 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 99 × 41 = 4059 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 138 + 149 = 282 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 231 + 703 = 934 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 57 × 68 = 3869 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 691 + 150 = 839 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 822 + 226 = 1048 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 99 × 50 = 4950 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 82 × 70 = 5740 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 711 + 614 = 1325 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 68 = 1638 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 18 = 342 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 461 + 788 = 1249 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 99 × 18 = 1782 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 905 + 716 = 1625 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 63 × 24 = 1512 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 80 × 33 = 2648 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 568 + 203 = 771 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 38 × 98 = 3728 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 807 + 583 = 1389 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 63 × 85 = 5350 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 79 × 41 = 3233 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 20 × 84 = 1680 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 69 × 68 = 4692 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 477 + 139 = 613 right or wrong? (a) Right (b) Wrong

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