Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 318 · 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 428 + 342 = 770 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 660 + 746 = 1406 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 363 + 251 = 614 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 77 × 85 = 6545 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 123 + 261 = 384 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 37 × 93 = 3441 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 48 × 65 = 3115 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 476 + 334 = 810 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 960 + 574 = 1534 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 14 × 23 = 314 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 463 + 808 = 1271 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 296 + 318 = 614 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 17 × 84 = 1428 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 80 × 67 = 5353 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 62 × 84 = 5205 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 948 + 561 = 1509 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 944 + 164 = 1115 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 310 + 814 = 1124 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 13 = 1079 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 312 + 903 = 1214 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 19 = 1339 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 72 × 63 = 4536 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 31 × 31 = 961 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 274 + 705 = 979 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 51 × 91 = 4648 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 80 × 95 = 7599 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 99 × 66 = 6528 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 403 + 444 = 847 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 31 × 27 = 837 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 63 = 3654 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 45 × 79 = 3555 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 264 + 988 = 1253 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 76 × 58 = 4410 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 76 × 65 = 4945 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 30 = 1585 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 46 = 2347 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 432 + 808 = 1247 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 13 × 76 = 981 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 696 + 151 = 851 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 944 + 202 = 1147 right or wrong? (a) Wrong (b) Right

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