Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 29 · 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 87 × 96 = 8352 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 79 × 47 = 3706 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 533 + 731 = 1261 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 95 = 3040 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 18 × 54 = 972 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 90 × 16 = 1443 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 47 = 2435 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 92 × 15 = 1387 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 58 × 40 = 2326 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 719 + 824 = 1543 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 72 × 14 = 1013 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 21 × 85 = 1785 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 683 + 981 = 1664 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 95 × 18 = 1710 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 987 + 613 = 1600 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 622 + 422 = 1039 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 625 + 247 = 872 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 550 + 379 = 928 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 52 × 97 = 5044 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 461 + 570 = 1031 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 267 + 146 = 413 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 54 = 3948 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 651 + 686 = 1328 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 938 + 400 = 1338 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 48 × 32 = 1536 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 81 × 77 = 6237 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 187 + 699 = 886 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 53 × 15 = 802 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 29 = 775 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 415 + 275 = 690 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 42 × 80 = 3360 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 265 + 305 = 565 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 49 × 95 = 4649 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 870 + 231 = 1101 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 24 × 99 = 2377 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 21 × 34 = 706 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 39 × 43 = 1677 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 47 × 96 = 4520 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 54 × 42 = 2266 right or wrong? (a) Wrong (b) Right

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