Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 598 · 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 48 × 57 = 2733 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 116 + 863 = 979 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 272 + 709 = 989 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 710 + 368 = 1078 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 851 + 429 = 1275 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 945 + 173 = 1112 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 13 × 83 = 1088 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 42 × 20 = 840 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 869 + 578 = 1447 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 831 + 971 = 1798 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 818 + 212 = 1030 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 902 + 861 = 1763 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 78 × 84 = 6552 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 74 × 12 = 888 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 34 × 69 = 2341 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 84 × 21 = 1756 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 543 + 411 = 954 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 53 = 1696 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 30 × 19 = 576 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 25 × 31 = 773 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 612 + 833 = 1445 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 23 × 46 = 1065 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 78 × 66 = 5142 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 47 = 2964 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 15 = 961 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 98 × 36 = 3528 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 55 × 49 = 2695 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 42 × 74 = 3117 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 48 × 14 = 672 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 31 × 29 = 901 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 14 × 74 = 1038 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 294 + 388 = 682 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 43 × 58 = 2487 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 79 = 2449 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 44 × 16 = 709 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 243 + 242 = 485 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 252 + 866 = 1118 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 543 + 869 = 1412 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 28 × 83 = 2324 right or wrong? (a) Wrong (b) Right

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