Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 914 · 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 783 + 616 = 1390 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 129 + 485 = 614 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 72 × 60 = 4320 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 432 + 604 = 1036 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 39 × 34 = 1317 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 12 × 34 = 416 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 869 + 975 = 1853 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 21 × 78 = 1638 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 429 + 505 = 941 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 332 + 920 = 1248 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 85 × 56 = 4757 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 839 + 562 = 1401 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 951 + 901 = 1852 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 889 + 168 = 1054 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 358 + 898 = 1256 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 36 × 84 = 3024 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 827 + 910 = 1737 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 872 + 169 = 1041 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 822 + 803 = 1625 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 886 + 937 = 1823 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 24 × 55 = 1320 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 82 × 81 = 6642 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 77 × 93 = 7152 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 400 + 918 = 1324 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 742 + 939 = 1681 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 38 × 26 = 981 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 50 × 30 = 1500 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 261 + 362 = 623 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 144 + 692 = 844 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 942 + 800 = 1742 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 25 × 69 = 1725 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 14 = 272 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 977 + 917 = 1894 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 517 + 391 = 901 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 692 + 842 = 1534 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 646 + 721 = 1369 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 34 × 40 = 1363 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 500 + 856 = 1356 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 863 + 258 = 1120 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 80 = 2560 right or wrong? (a) Wrong (b) Right

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