Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 819 · 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 58 × 52 = 3011 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 808 + 767 = 1575 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 272 + 596 = 876 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 33 × 75 = 2475 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 713 + 365 = 1078 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 13 × 19 = 247 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 120 + 663 = 783 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 861 + 201 = 1062 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 64 × 99 = 6333 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 938 + 760 = 1702 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 83 × 72 = 5976 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 916 + 246 = 1153 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 494 + 353 = 847 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 63 × 40 = 2511 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 96 × 80 = 7684 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 963 + 571 = 1535 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 278 + 485 = 761 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 75 × 35 = 2622 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 41 × 13 = 533 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 50 × 90 = 4504 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 114 + 389 = 503 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 339 + 308 = 647 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 318 + 207 = 525 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 15 × 81 = 1215 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 915 + 602 = 1517 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 219 + 271 = 494 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 24 = 1973 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 608 + 271 = 879 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 52 × 85 = 4420 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 536 + 650 = 1185 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 530 + 138 = 668 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 95 × 80 = 7600 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 52 × 64 = 3328 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 667 + 796 = 1454 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 87 = 3132 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 46 = 1564 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 680 + 360 = 1042 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 218 + 904 = 1122 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 173 + 373 = 546 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 297 + 554 = 852 right or wrong? (a) Wrong (b) Right

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