Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 158 · 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 19 × 36 = 688 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 826 + 112 = 938 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 93 × 78 = 7254 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 60 = 839 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 742 + 130 = 872 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 192 + 210 = 404 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 33 × 94 = 3102 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 74 × 90 = 6660 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 67 × 53 = 3551 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 42 = 849 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 61 × 39 = 2380 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 324 + 221 = 552 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 686 + 165 = 851 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 393 + 841 = 1234 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 842 + 644 = 1486 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 703 + 826 = 1529 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 40 × 34 = 1360 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 442 + 948 = 1390 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 71 × 81 = 5748 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 675 + 352 = 1027 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 19 × 44 = 837 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 743 + 660 = 1403 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 172 + 904 = 1067 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 138 + 940 = 1076 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 55 × 88 = 4831 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 159 + 793 = 952 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 30 = 1058 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 62 × 46 = 2852 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 90 × 62 = 5577 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 66 × 70 = 4612 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 84 × 12 = 1008 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 450 + 378 = 827 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 12 × 30 = 353 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 234 + 819 = 1053 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 950 + 962 = 1912 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 214 + 161 = 382 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 48 × 84 = 4032 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 32 × 31 = 996 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 613 + 132 = 744 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 854 + 957 = 1802 right or wrong? (a) Right (b) Wrong

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