Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 984 · 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 27 × 36 = 980 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 13 × 28 = 365 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 837 + 475 = 1312 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 74 × 49 = 3628 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 865 + 210 = 1071 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 18 × 83 = 1493 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 24 × 25 = 600 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 370 + 844 = 1214 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 91 × 26 = 2366 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 62 × 17 = 1054 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 269 + 112 = 374 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 217 + 285 = 501 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 72 × 77 = 5549 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 601 + 566 = 1167 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 51 = 2601 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 72 × 13 = 939 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 649 + 668 = 1311 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 119 + 913 = 1039 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 584 + 958 = 1541 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 126 + 932 = 1054 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 315 + 200 = 515 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 459 + 457 = 911 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 47 × 27 = 1271 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 89 × 71 = 6319 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 36 × 51 = 1834 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 31 × 32 = 1000 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 465 + 208 = 673 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 568 + 820 = 1382 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 265 + 880 = 1145 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 28 × 23 = 644 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 41 = 868 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 45 × 42 = 1892 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 75 = 2775 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 514 + 701 = 1215 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 835 + 558 = 1393 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 22 = 1210 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 85 × 59 = 5015 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 67 = 3746 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 838 + 900 = 1738 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 93 × 96 = 8923 right or wrong? (a) Right (b) Wrong

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