Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 752 · 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 339 + 277 = 616 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 96 × 17 = 1632 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 45 × 83 = 3735 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 345 + 213 = 553 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 493 + 504 = 997 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 43 × 61 = 2623 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 928 + 454 = 1382 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 65 × 66 = 4290 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 105 + 782 = 884 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 315 + 768 = 1083 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 89 × 57 = 5071 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 67 × 87 = 5825 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 942 + 212 = 1154 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 769 + 845 = 1614 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 263 + 593 = 864 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 713 + 315 = 1028 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 668 + 156 = 824 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 553 + 451 = 1000 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 63 × 51 = 3213 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 74 = 4961 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 934 + 143 = 1077 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 23 × 36 = 832 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 285 + 324 = 609 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 89 × 96 = 8546 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 62 × 33 = 2046 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 463 + 895 = 1358 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 861 + 419 = 1279 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 23 × 64 = 1471 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 18 × 85 = 1530 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 724 + 203 = 927 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 838 + 375 = 1204 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 35 × 79 = 2757 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 76 × 57 = 4332 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 15 × 27 = 405 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 511 + 918 = 1433 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 56 × 24 = 1341 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 92 × 21 = 1935 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 544 + 962 = 1514 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 257 + 378 = 635 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 62 × 22 = 1364 right or wrong? (a) Right (b) Wrong

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