Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 739 · 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 37 × 97 = 3589 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 41 × 39 = 1602 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 69 × 59 = 4064 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 21 × 57 = 1200 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 754 + 874 = 1628 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 314 + 866 = 1180 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 533 + 805 = 1333 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 296 + 248 = 548 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 703 + 809 = 1512 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 35 × 78 = 2730 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 26 × 90 = 2340 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 82 × 99 = 8109 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 49 × 92 = 4508 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 844 + 366 = 1204 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 70 = 5530 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 15 × 37 = 554 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 455 + 969 = 1424 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 595 + 779 = 1374 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 40 × 54 = 2160 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 69 × 89 = 6141 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 550 + 141 = 691 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 62 × 90 = 5579 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 678 + 689 = 1367 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 42 × 32 = 1335 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 61 × 23 = 1410 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 418 + 460 = 878 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 95 × 79 = 7505 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 30 × 28 = 842 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 690 + 436 = 1126 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 395 + 710 = 1096 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 293 + 241 = 534 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 957 + 814 = 1770 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 23 = 690 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 20 × 85 = 1696 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 492 + 449 = 941 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 664 + 962 = 1628 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 429 + 165 = 594 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 93 × 82 = 7631 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 76 × 64 = 4864 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 74 × 42 = 3108 right or wrong? (a) Wrong (b) Right

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