Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 51 · 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 46 × 89 = 4094 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 766 + 924 = 1690 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 63 = 4215 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 357 + 967 = 1324 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 727 + 620 = 1346 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 966 + 765 = 1731 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 15 × 34 = 510 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 73 × 37 = 2701 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 49 × 28 = 1371 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 391 + 822 = 1222 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 26 × 12 = 306 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 568 + 470 = 1035 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 59 = 2063 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 31 = 713 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 80 × 61 = 4889 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 380 + 400 = 780 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 871 + 920 = 1800 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 864 + 937 = 1801 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 72 × 39 = 2808 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 82 × 42 = 3444 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 406 + 941 = 1350 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 62 × 22 = 1364 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 533 + 813 = 1346 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 69 × 38 = 2616 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 345 + 584 = 932 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 26 × 34 = 885 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 345 + 670 = 1007 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 123 + 284 = 415 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 22 × 26 = 567 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 67 = 1876 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 26 = 399 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 804 + 170 = 983 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 113 + 786 = 893 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 603 + 712 = 1311 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 90 = 8375 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 219 + 437 = 656 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 220 + 681 = 898 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 731 + 427 = 1158 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 51 × 82 = 4176 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 25 × 74 = 1845 right or wrong? (a) Wrong (b) Right

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