Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 701 · 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 × 20 = 506 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 482 + 242 = 724 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 38 × 65 = 2478 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 20 × 58 = 1160 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 44 × 29 = 1276 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 31 × 80 = 2471 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 30 × 16 = 472 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 68 × 91 = 6188 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 75 × 39 = 2925 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 16 × 15 = 247 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 486 + 377 = 866 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 803 + 152 = 963 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 320 + 221 = 541 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 81 × 70 = 5665 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 90 × 29 = 2603 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 35 = 2170 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 143 + 142 = 284 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 16 × 26 = 420 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 90 × 83 = 7468 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 643 + 359 = 1002 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 12 × 50 = 600 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 39 = 1404 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 83 × 39 = 3246 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 315 + 942 = 1253 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 126 + 482 = 608 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 23 × 26 = 604 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 479 + 993 = 1472 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 69 × 25 = 1716 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 66 × 73 = 4812 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 782 + 598 = 1380 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 505 + 738 = 1245 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 43 × 89 = 3827 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 280 + 272 = 551 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 232 + 110 = 347 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 530 + 139 = 669 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 66 × 16 = 1056 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 76 × 36 = 2736 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 666 + 823 = 1490 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 199 + 285 = 484 right or wrong? (a) Wrong (b) Right

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