Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 694 · 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 154 + 910 = 1064 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 892 + 115 = 1007 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 80 = 2961 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 130 + 549 = 679 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 40 × 31 = 1248 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 19 = 1292 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 81 × 40 = 3240 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 216 + 684 = 900 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 74 × 43 = 3179 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 44 × 50 = 2200 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 20 × 36 = 719 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 20 × 69 = 1385 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 535 + 414 = 954 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 995 + 719 = 1712 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 86 × 46 = 3949 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 127 + 444 = 571 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 583 + 251 = 835 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 937 + 816 = 1749 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 798 + 981 = 1779 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 242 + 556 = 802 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 64 × 75 = 4793 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 32 × 54 = 1719 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 91 × 30 = 2730 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 401 + 343 = 747 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 967 + 697 = 1664 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 74 × 53 = 3921 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 53 = 3498 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 41 × 93 = 3820 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 179 + 252 = 431 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 77 × 97 = 7469 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 65 × 80 = 5200 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 52 × 74 = 3848 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 92 × 98 = 9018 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 699 + 599 = 1298 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 17 × 48 = 816 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 44 × 63 = 2772 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 42 = 629 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 503 + 796 = 1306 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 85 × 17 = 1445 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 738 + 794 = 1532 right or wrong? (a) Right (b) Wrong

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