Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 154 · 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 642 + 728 = 1370 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 150 + 609 = 760 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 97 × 70 = 6790 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 581 + 665 = 1246 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 212 + 557 = 769 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 75 × 35 = 2619 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 968 + 667 = 1636 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 849 + 249 = 1089 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 47 × 71 = 3337 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 25 × 37 = 922 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 58 × 84 = 4872 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 391 + 408 = 799 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 33 × 76 = 2504 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 338 + 758 = 1087 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 24 × 33 = 784 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 73 × 31 = 2267 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 85 = 5264 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 75 × 74 = 5550 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 89 × 69 = 6141 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 52 × 48 = 2504 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 838 + 375 = 1213 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 49 × 57 = 2800 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 72 × 63 = 4533 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 80 × 90 = 7204 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 48 × 12 = 570 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 25 × 50 = 1243 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 715 + 402 = 1111 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 599 + 787 = 1386 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 97 = 2619 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 358 + 333 = 682 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 603 + 166 = 769 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 45 × 22 = 990 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 59 × 86 = 5065 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 44 × 26 = 1144 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 41 × 89 = 3649 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 27 × 34 = 915 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 69 × 41 = 2833 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 61 × 41 = 2501 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 55 × 57 = 3135 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 154 + 713 = 867 right or wrong? (a) Wrong (b) Right

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