Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 459 · 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 571 + 984 = 1555 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 35 × 44 = 1540 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 262 + 313 = 578 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 56 × 44 = 2461 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 762 + 730 = 1494 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 566 + 327 = 893 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 56 = 4816 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 32 × 71 = 2274 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 906 + 726 = 1632 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 281 + 771 = 1052 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 775 + 457 = 1232 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 80 × 34 = 2711 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 75 × 18 = 1350 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 579 + 233 = 812 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 971 + 501 = 1472 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 23 = 529 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 14 × 73 = 1013 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 38 × 31 = 1178 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 79 × 70 = 5530 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 64 × 63 = 4035 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 68 = 1224 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 78 × 90 = 7027 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 122 + 283 = 398 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 329 + 904 = 1241 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 551 + 511 = 1067 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 114 + 646 = 760 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 788 + 314 = 1111 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 687 + 258 = 945 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 99 × 48 = 4752 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 539 + 232 = 762 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 958 + 648 = 1606 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 900 + 155 = 1058 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 643 + 823 = 1458 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 913 + 195 = 1103 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 52 × 62 = 3224 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 75 × 55 = 4125 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 50 × 77 = 3857 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 924 + 824 = 1747 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 86 × 97 = 8340 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 735 + 393 = 1128 right or wrong? (a) Right (b) Wrong

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