Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 934 · 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 99 × 52 = 5139 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 78 × 74 = 5773 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 47 × 25 = 1173 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 48 × 73 = 3509 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 588 + 571 = 1159 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 109 + 304 = 410 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 202 + 110 = 312 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 746 + 174 = 912 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 759 + 724 = 1483 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 711 + 156 = 866 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 155 + 236 = 391 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 449 + 643 = 1092 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 127 + 984 = 1108 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 959 + 206 = 1167 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 45 × 40 = 1806 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 90 × 60 = 5400 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 307 + 747 = 1061 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 77 × 88 = 6776 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 88 = 3872 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 605 + 483 = 1086 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 424 + 204 = 628 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 31 = 2257 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 55 × 48 = 2640 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 182 + 479 = 661 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 778 + 690 = 1469 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 392 + 158 = 550 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 462 + 875 = 1337 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 89 × 49 = 4356 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 731 + 986 = 1724 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 132 + 350 = 482 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 64 = 1728 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 36 = 1232 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 169 + 828 = 988 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 428 + 972 = 1403 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 284 + 308 = 592 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 42 × 55 = 2310 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 821 + 863 = 1684 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 23 × 74 = 1702 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 32 × 90 = 2871 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 621 + 863 = 1489 right or wrong? (a) Wrong (b) Right

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