Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 907 · 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 30 × 72 = 2160 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 548 + 174 = 722 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 67 × 63 = 4212 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 55 × 36 = 1986 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 369 + 763 = 1132 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 887 + 386 = 1268 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 137 + 902 = 1034 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 45 × 18 = 817 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 49 × 74 = 3626 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 280 + 809 = 1089 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 41 × 28 = 1148 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 13 × 20 = 260 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 582 + 635 = 1217 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 27 = 1188 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 89 × 17 = 1522 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 359 + 764 = 1123 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 31 × 80 = 2481 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 782 + 713 = 1493 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 517 + 982 = 1499 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 22 × 19 = 418 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 551 + 902 = 1453 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 28 × 76 = 2131 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 44 × 44 = 1936 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 83 × 89 = 7378 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 14 × 77 = 1073 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 425 + 952 = 1385 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 17 = 1081 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 710 + 658 = 1368 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 76 × 79 = 6003 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 16 × 61 = 979 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 712 + 287 = 999 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 808 + 936 = 1750 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 25 = 752 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 651 + 462 = 1112 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 71 × 93 = 6598 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 704 + 136 = 844 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 46 × 93 = 4279 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 88 = 2814 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 483 + 385 = 868 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 97 × 90 = 8730 right or wrong? (a) Right (b) Wrong

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