Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 350 · 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 714 + 482 = 1198 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 314 + 157 = 471 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 34 × 76 = 2584 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 115 + 482 = 606 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 274 + 221 = 501 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 360 + 808 = 1168 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 304 + 696 = 1003 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 93 × 74 = 6882 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 39 × 46 = 1794 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 65 × 53 = 3445 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 637 + 166 = 807 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 691 + 164 = 857 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 69 × 60 = 4140 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 735 + 239 = 974 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 58 × 84 = 4871 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 485 + 226 = 707 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 621 + 154 = 769 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 30 × 57 = 1710 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 303 + 604 = 907 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 299 + 691 = 988 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 487 + 825 = 1312 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 406 + 322 = 728 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 663 + 218 = 881 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 550 + 723 = 1276 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 409 + 452 = 856 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 833 + 874 = 1698 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 291 + 577 = 863 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 48 × 28 = 1344 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 87 × 68 = 5916 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 64 = 6343 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 16 × 15 = 240 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 61 = 1403 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 91 = 1183 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 725 + 611 = 1341 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 889 + 126 = 1015 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 262 + 332 = 587 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 12 × 20 = 240 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 86 = 1041 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 707 + 886 = 1593 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 44 × 76 = 3348 right or wrong? (a) Wrong (b) Right

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