Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 893 · 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 712 + 429 = 1141 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 900 + 450 = 1350 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 27 × 22 = 599 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 27 = 945 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 862 + 270 = 1133 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 61 × 95 = 5795 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 15 × 87 = 1305 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 30 × 33 = 990 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 544 + 373 = 919 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 52 = 1508 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 36 × 94 = 3381 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 63 × 59 = 3713 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 532 + 277 = 802 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 59 × 18 = 1062 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 722 + 787 = 1518 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 42 × 81 = 3401 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 127 + 272 = 399 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 60 = 2586 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 944 + 504 = 1441 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 16 × 74 = 1183 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 93 × 46 = 4278 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 87 × 25 = 2167 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 905 + 452 = 1357 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 12 × 74 = 888 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 60 × 99 = 5940 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 34 = 910 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 824 + 183 = 1007 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 853 + 956 = 1809 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 660 + 836 = 1487 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 57 × 79 = 4503 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 164 + 640 = 804 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 19 = 372 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 732 + 692 = 1415 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 46 × 99 = 4562 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 175 + 931 = 1106 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 219 + 288 = 507 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 711 + 487 = 1201 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 50 × 74 = 3700 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 69 × 89 = 6133 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 27 × 65 = 1758 right or wrong? (a) Right (b) Wrong

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