Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 884 · 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 782 + 929 = 1716 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 865 + 379 = 1240 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 376 + 480 = 856 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 172 + 455 = 627 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 295 + 156 = 451 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 22 × 23 = 501 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 26 × 85 = 2205 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 688 + 936 = 1632 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 653 + 502 = 1155 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 244 + 380 = 624 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 82 × 33 = 2706 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 168 + 309 = 477 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 32 = 873 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 968 + 789 = 1752 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 363 + 917 = 1278 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 146 + 712 = 863 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 523 + 313 = 836 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 85 = 1785 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 585 + 792 = 1377 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 229 + 709 = 938 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 352 + 343 = 687 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 77 × 28 = 2150 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 85 × 74 = 6290 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 323 + 197 = 526 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 69 × 16 = 1104 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 106 + 569 = 676 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 854 + 776 = 1630 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 300 + 359 = 668 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 68 × 24 = 1631 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 77 × 78 = 6006 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 428 + 662 = 1082 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 754 + 279 = 1033 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 720 + 187 = 899 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 46 × 45 = 2070 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 735 + 589 = 1320 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 690 + 519 = 1209 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 705 + 724 = 1429 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 78 × 93 = 7254 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 51 × 90 = 4581 right or wrong? (a) Wrong (b) Right

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