Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 632 · 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 738 + 395 = 1133 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 30 × 13 = 390 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 108 + 108 = 216 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 31 × 20 = 618 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 301 + 453 = 748 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 39 × 90 = 3501 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 87 = 1828 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 673 + 514 = 1180 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 180 + 452 = 640 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 141 + 141 = 287 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 507 + 832 = 1339 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 27 × 19 = 506 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 635 + 667 = 1302 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 88 × 25 = 2200 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 241 + 813 = 1057 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 49 × 45 = 2205 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 82 × 99 = 8118 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 752 + 418 = 1178 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 90 × 39 = 3510 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 513 + 997 = 1510 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 268 + 494 = 762 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 693 + 502 = 1197 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 334 + 240 = 583 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 65 = 3770 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 69 × 87 = 6000 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 18 = 598 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 389 + 546 = 935 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 60 × 84 = 5032 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 83 × 75 = 6225 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 65 × 87 = 5655 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 917 + 862 = 1779 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 68 × 91 = 6188 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 34 = 2242 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 96 = 3360 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 40 × 78 = 3129 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 568 + 371 = 939 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 216 + 681 = 903 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 48 × 78 = 3744 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 523 + 596 = 1119 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 241 + 225 = 460 right or wrong? (a) Right (b) Wrong

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