Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 876 · 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 708 + 595 = 1303 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 85 × 23 = 1955 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 24 × 92 = 2208 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 70 × 95 = 6649 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 23 × 19 = 443 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 314 + 442 = 756 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 944 + 688 = 1632 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 834 + 391 = 1219 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 60 × 83 = 4980 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 55 × 71 = 3905 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 632 + 865 = 1496 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 166 + 132 = 292 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 184 + 453 = 637 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 25 × 37 = 930 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 91 = 4370 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 255 + 959 = 1214 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 759 + 986 = 1744 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 912 + 734 = 1639 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 499 + 744 = 1244 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 224 + 656 = 880 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 769 + 571 = 1340 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 65 × 56 = 3640 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 62 × 42 = 2604 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 498 + 203 = 697 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 603 + 109 = 704 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 764 + 386 = 1150 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 215 + 603 = 824 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 514 + 179 = 700 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 360 + 320 = 680 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 831 + 382 = 1216 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 57 × 17 = 969 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 133 + 615 = 744 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 936 + 152 = 1083 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 39 × 73 = 2847 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 707 + 109 = 815 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 733 + 595 = 1328 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 77 × 34 = 2618 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 35 × 67 = 2346 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 44 × 94 = 4136 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 93 × 26 = 2418 right or wrong? (a) Right (b) Wrong

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