Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 356 · 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 47 × 31 = 1457 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 51 = 1938 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 66 × 72 = 4752 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 78 × 28 = 2184 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 47 × 16 = 760 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 71 × 60 = 4260 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 91 = 2002 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 53 × 16 = 848 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 48 × 15 = 720 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 990 + 948 = 1938 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 63 × 90 = 5669 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 358 + 143 = 507 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 96 × 91 = 8736 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 548 + 830 = 1378 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 54 × 66 = 3564 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 29 = 1740 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 21 × 27 = 567 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 427 + 247 = 674 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 596 + 931 = 1531 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 76 × 82 = 6235 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 342 + 445 = 778 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 799 + 278 = 1085 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 329 + 653 = 974 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 589 + 181 = 769 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 86 = 1542 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 847 + 822 = 1671 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 89 × 65 = 5785 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 87 × 94 = 8177 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 821 + 515 = 1333 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 61 × 41 = 2501 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 633 + 866 = 1506 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 68 × 26 = 1768 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 478 + 161 = 643 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 39 × 20 = 780 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 897 + 311 = 1207 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 512 + 556 = 1068 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 20 × 79 = 1580 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 238 + 817 = 1055 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 74 × 21 = 1551 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 910 + 707 = 1615 right or wrong? (a) Wrong (b) Right

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