Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 488 · 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 21 × 27 = 567 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 37 × 70 = 2588 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 63 × 92 = 5794 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 28 × 37 = 1036 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 68 = 2176 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 46 × 16 = 736 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 13 × 28 = 367 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 81 × 93 = 7528 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 971 + 480 = 1446 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 544 + 996 = 1540 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 79 × 92 = 7260 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 32 × 69 = 2216 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 691 + 156 = 851 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 99 × 31 = 3069 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 287 + 790 = 1077 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 51 × 74 = 3774 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 75 × 26 = 1950 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 81 × 68 = 5514 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 36 × 74 = 2664 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 469 + 189 = 658 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 80 × 24 = 1913 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 31 × 56 = 1736 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 35 × 89 = 3115 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 70 = 5040 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 81 × 17 = 1369 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 58 × 79 = 4582 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 109 + 374 = 487 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 781 + 320 = 1101 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 34 × 75 = 2550 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 936 + 389 = 1319 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 706 + 915 = 1621 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 53 × 83 = 4399 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 925 + 343 = 1268 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 812 + 930 = 1749 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 200 + 947 = 1147 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 52 × 55 = 2860 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 51 × 66 = 3373 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 68 × 64 = 4352 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 72 × 46 = 3319 right or wrong? (a) Right (b) Wrong

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