Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 783 · 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 997 + 112 = 1101 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 382 + 984 = 1365 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 418 + 833 = 1251 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 936 + 923 = 1851 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 34 × 16 = 544 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 771 + 761 = 1532 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 617 + 481 = 1096 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 694 + 639 = 1327 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 49 × 25 = 1231 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 23 × 73 = 1679 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 87 × 90 = 7838 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 99 × 86 = 8514 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 237 + 113 = 351 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 790 + 234 = 1024 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 589 + 543 = 1133 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 201 + 377 = 582 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 568 + 531 = 1099 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 419 + 933 = 1352 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 27 × 25 = 675 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 76 × 42 = 3196 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 263 + 604 = 859 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 472 + 411 = 883 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 73 × 91 = 6641 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 63 × 15 = 954 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 31 × 42 = 1302 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 26 × 31 = 806 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 852 + 117 = 967 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 63 × 54 = 3402 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 690 + 423 = 1113 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 21 = 546 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 480 + 495 = 975 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 67 × 45 = 3015 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 530 + 523 = 1049 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 28 × 82 = 2296 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 62 × 37 = 2291 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 802 + 342 = 1137 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 14 × 42 = 588 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 809 + 719 = 1528 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 164 + 639 = 798 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 387 + 224 = 611 right or wrong? (a) Wrong (b) Right

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