Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 858 · 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 964 + 486 = 1452 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 875 + 110 = 985 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 64 × 76 = 4864 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 171 + 614 = 776 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 557 + 726 = 1283 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 54 × 24 = 1296 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 81 × 31 = 2503 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 202 + 682 = 884 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 327 + 560 = 887 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 36 × 89 = 3212 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 193 + 167 = 360 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 256 + 584 = 840 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 286 + 519 = 805 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 327 + 642 = 968 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 47 × 33 = 1544 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 41 × 39 = 1593 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 49 × 68 = 3332 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 92 = 3225 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 542 + 517 = 1059 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 578 + 203 = 781 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 695 + 136 = 831 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 786 + 717 = 1503 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 744 + 784 = 1528 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 25 = 350 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 700 + 963 = 1662 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 92 × 71 = 6532 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 965 + 398 = 1360 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 779 + 132 = 909 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 738 + 486 = 1218 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 24 × 32 = 768 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 13 × 26 = 338 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 798 + 279 = 1080 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 81 = 4626 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 58 × 36 = 2088 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 67 = 5896 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 76 × 24 = 1824 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 39 = 867 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 456 + 998 = 1454 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 48 = 1051 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 147 + 708 = 855 right or wrong? (a) Wrong (b) Right

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