Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 511 · 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 75 × 70 = 5250 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 62 × 52 = 3224 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 218 + 673 = 888 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 17 × 79 = 1343 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 96 × 92 = 8825 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 269 + 569 = 838 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 577 + 869 = 1446 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 85 × 50 = 4242 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 26 × 52 = 1346 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 71 = 1071 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 39 × 64 = 2496 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 640 + 399 = 1034 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 880 + 299 = 1174 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 16 × 17 = 266 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 59 = 4654 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 571 + 689 = 1254 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 63 × 93 = 5859 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 356 + 755 = 1111 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 33 × 71 = 2343 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 32 × 14 = 448 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 221 + 120 = 344 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 44 × 37 = 1628 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 78 × 26 = 2022 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 657 + 431 = 1088 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 810 + 206 = 1021 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 76 × 66 = 5016 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 786 + 504 = 1297 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 51 × 37 = 1887 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 567 + 682 = 1240 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 99 × 53 = 5256 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 584 + 501 = 1085 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 899 + 832 = 1731 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 31 × 68 = 2105 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 831 + 658 = 1489 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 894 + 992 = 1886 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 18 × 42 = 756 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 764 + 169 = 940 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 65 × 37 = 2400 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 477 + 438 = 923 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 41 × 93 = 3810 right or wrong? (a) Right (b) Wrong

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