Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 649 · 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 443 + 641 = 1084 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 14 × 26 = 357 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 683 + 157 = 846 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 411 + 558 = 965 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 53 × 85 = 4505 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 736 + 280 = 1008 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 65 × 38 = 2470 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 86 × 34 = 2931 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 65 × 39 = 2535 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 26 × 97 = 2516 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 897 + 256 = 1144 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 429 + 643 = 1072 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 74 × 79 = 5854 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 97 × 82 = 7945 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 40 × 55 = 2200 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 64 × 31 = 1984 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 764 + 739 = 1498 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 98 × 96 = 9408 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 948 + 797 = 1745 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 72 × 79 = 5688 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 87 × 83 = 7221 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 491 + 259 = 750 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 374 + 835 = 1216 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 476 + 294 = 770 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 754 + 912 = 1666 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 90 × 63 = 5666 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 42 = 1470 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 72 × 96 = 6912 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 80 × 31 = 2477 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 716 + 341 = 1057 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 62 × 72 = 4464 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 99 × 60 = 5940 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 655 + 675 = 1330 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 797 + 326 = 1120 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 82 × 13 = 1066 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 98 × 87 = 8526 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 933 + 936 = 1869 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 36 = 581 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 749 + 798 = 1548 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 594 + 838 = 1432 right or wrong? (a) Wrong (b) Right

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