Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 40 · 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 84 × 76 = 6387 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 32 × 75 = 2402 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 74 = 2590 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 384 + 470 = 851 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 212 + 567 = 785 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 847 + 156 = 998 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 70 × 17 = 1190 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 115 + 869 = 984 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 34 × 67 = 2278 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 27 × 85 = 2295 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 297 + 689 = 984 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 62 × 48 = 2968 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 34 × 84 = 2856 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 47 × 99 = 4654 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 530 + 871 = 1401 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 69 × 46 = 3179 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 404 + 363 = 767 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 57 × 64 = 3648 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 715 + 765 = 1480 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 583 + 491 = 1074 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 658 + 131 = 789 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 690 + 246 = 936 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 13 × 22 = 286 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 206 + 630 = 834 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 585 + 567 = 1152 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 29 × 80 = 2320 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 71 = 5815 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 120 + 223 = 343 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 476 + 571 = 1047 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 596 + 547 = 1135 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 68 × 71 = 4828 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 76 × 98 = 7448 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 16 × 33 = 530 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 89 × 44 = 3917 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 318 + 543 = 870 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 781 + 233 = 1014 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 214 + 579 = 801 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 67 × 31 = 2077 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 53 × 66 = 3491 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 603 + 224 = 827 right or wrong? (a) Right (b) Wrong

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