Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 45 · 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 25 × 74 = 1850 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 71 × 49 = 3479 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 765 + 840 = 1605 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 305 + 115 = 415 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 912 + 707 = 1611 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 173 + 479 = 661 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 192 + 616 = 808 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 289 + 134 = 423 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 18 = 900 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 547 + 466 = 1012 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 246 + 598 = 851 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 72 × 37 = 2656 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 16 × 68 = 1090 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 31 × 37 = 1147 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 201 + 702 = 903 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 219 + 366 = 594 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 99 × 79 = 7821 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 72 × 95 = 6840 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 904 + 635 = 1539 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 808 + 120 = 933 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 964 + 946 = 1913 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 115 + 874 = 981 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 54 × 91 = 4910 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 438 + 845 = 1277 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 64 × 47 = 3006 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 73 × 57 = 4161 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 78 × 15 = 1170 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 952 + 896 = 1848 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 97 × 46 = 4462 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 64 × 59 = 3775 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 946 + 661 = 1607 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 583 + 900 = 1483 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 902 + 985 = 1886 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 129 + 718 = 847 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 53 × 68 = 3604 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 94 × 67 = 6302 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 52 × 83 = 4311 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 494 + 171 = 668 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 66 × 62 = 4092 right or wrong? (a) Wrong (b) Right

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