Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 822 · 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 765 + 580 = 1345 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 25 × 49 = 1225 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 96 = 2400 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 80 × 21 = 1680 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 596 + 233 = 829 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 846 + 644 = 1493 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 566 + 446 = 1012 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 94 × 81 = 7614 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 286 + 271 = 557 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 32 × 78 = 2496 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 867 + 214 = 1081 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 914 + 663 = 1576 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 51 × 17 = 867 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 402 + 991 = 1393 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 98 × 29 = 2842 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 509 + 935 = 1451 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 288 + 387 = 675 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 25 × 50 = 1249 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 55 × 56 = 3080 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 247 + 419 = 675 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 57 × 40 = 2280 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 328 + 594 = 922 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 416 + 274 = 690 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 172 + 413 = 593 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 81 × 57 = 4621 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 267 + 517 = 784 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 367 + 161 = 522 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 126 + 609 = 731 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 53 × 17 = 901 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 31 × 36 = 1116 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 647 + 394 = 1035 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 234 + 837 = 1071 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 957 + 173 = 1127 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 34 = 1453 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 40 = 3315 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 427 + 161 = 583 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 907 + 663 = 1577 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 610 + 597 = 1207 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 186 + 890 = 1076 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 71 × 99 = 7038 right or wrong? (a) Right (b) Wrong

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