Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 832 · 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 935 + 557 = 1488 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 33 × 79 = 2606 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 28 = 924 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 86 × 91 = 7829 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 268 + 412 = 688 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 63 × 48 = 3023 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 688 + 122 = 810 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 18 × 72 = 1296 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 61 × 26 = 1586 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 57 × 66 = 3768 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 782 + 936 = 1710 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 203 + 434 = 641 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 67 × 75 = 5025 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 16 × 85 = 1360 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 52 × 48 = 2487 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 83 × 40 = 3313 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 443 + 962 = 1405 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 758 + 961 = 1719 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 874 + 285 = 1159 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 30 × 31 = 930 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 458 + 625 = 1083 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 38 × 68 = 2581 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 62 = 4650 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 302 + 310 = 612 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 81 × 92 = 7447 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 13 = 828 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 269 + 610 = 879 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 29 = 493 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 49 × 74 = 3625 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 58 = 1508 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 23 × 18 = 414 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 590 + 327 = 917 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 34 × 34 = 1152 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 23 × 28 = 645 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 33 × 26 = 849 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 871 + 251 = 1122 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 79 × 95 = 7502 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 19 × 92 = 1748 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 29 = 609 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 236 + 506 = 742 right or wrong? (a) Right (b) Wrong

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