Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 586 · 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 345 + 660 = 1005 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 47 × 94 = 4419 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 866 + 434 = 1309 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 27 × 60 = 1620 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 54 × 82 = 4428 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 554 + 364 = 925 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 62 × 66 = 4092 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 664 + 166 = 830 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 68 × 48 = 3264 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 83 × 18 = 1494 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 372 + 902 = 1266 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 30 = 2857 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 21 = 540 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 27 = 459 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 35 × 23 = 805 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 84 × 71 = 5957 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 867 + 145 = 1012 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 469 + 737 = 1206 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 140 + 332 = 472 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 12 × 70 = 840 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 16 = 816 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 252 + 964 = 1216 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 62 × 90 = 5587 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 54 × 81 = 4374 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 25 × 38 = 954 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 116 + 351 = 467 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 21 × 43 = 903 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 378 + 330 = 702 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 67 × 45 = 3011 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 453 + 389 = 843 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 227 + 824 = 1051 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 27 × 13 = 351 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 64 × 47 = 3008 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 625 + 730 = 1362 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 75 × 21 = 1575 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 906 + 389 = 1295 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 625 + 972 = 1597 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 79 × 74 = 5837 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 770 + 237 = 1007 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 88 × 26 = 2288 right or wrong? (a) Wrong (b) Right

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