Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 682 · 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 91 × 62 = 5642 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 187 + 400 = 586 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 81 × 41 = 3316 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 87 × 90 = 7838 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 434 + 371 = 813 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 657 + 293 = 950 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 53 × 34 = 1809 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 383 + 723 = 1106 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 373 + 776 = 1152 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 516 + 113 = 629 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 246 + 328 = 570 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 542 + 302 = 844 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 73 × 13 = 942 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 258 + 208 = 466 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 621 + 740 = 1355 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 789 + 214 = 1003 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 37 × 39 = 1438 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 434 + 593 = 1020 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 76 × 82 = 6224 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 63 × 78 = 4905 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 69 × 45 = 3097 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 63 × 77 = 4847 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 68 × 91 = 6188 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 87 × 13 = 1131 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 70 × 64 = 4471 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 134 + 688 = 822 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 15 × 41 = 608 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 94 × 12 = 1120 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 97 × 89 = 8633 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 407 + 930 = 1339 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 927 + 110 = 1037 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 782 + 711 = 1493 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 731 + 828 = 1556 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 54 × 36 = 1944 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 26 × 55 = 1437 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 78 × 37 = 2886 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 46 × 93 = 4278 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 25 × 97 = 2425 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 32 × 80 = 2560 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 871 + 633 = 1506 right or wrong? (a) Wrong (b) Right

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