Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 39 · 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 68 × 56 = 3805 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 949 + 447 = 1396 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 872 + 313 = 1188 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 397 + 521 = 912 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 330 + 123 = 449 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 344 + 373 = 717 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 29 × 47 = 1363 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 259 + 375 = 634 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 42 × 58 = 2433 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 890 + 665 = 1555 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 647 + 616 = 1263 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 645 + 369 = 1015 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 719 + 712 = 1427 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 87 × 89 = 7742 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 52 × 99 = 5149 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 84 × 15 = 1263 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 26 = 1604 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 924 + 898 = 1823 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 85 × 78 = 6626 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 44 × 92 = 4048 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 742 + 603 = 1345 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 299 + 165 = 458 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 757 + 520 = 1277 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 917 + 231 = 1148 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 749 + 377 = 1126 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 409 + 527 = 936 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 597 + 279 = 873 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 604 + 629 = 1234 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 55 × 30 = 1650 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 12 × 41 = 492 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 838 + 134 = 977 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 913 + 156 = 1069 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 819 + 744 = 1563 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 13 × 50 = 650 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 378 + 436 = 814 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 21 × 49 = 1029 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 35 × 93 = 3255 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 73 × 96 = 7008 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 41 × 25 = 1025 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 966 + 693 = 1659 right or wrong? (a) Right (b) Wrong

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