Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 436 · 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 254 + 447 = 701 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 90 × 25 = 2250 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 55 = 939 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 339 + 555 = 894 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 989 + 925 = 1919 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 98 × 72 = 7058 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 589 + 287 = 876 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 32 × 47 = 1508 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 53 × 15 = 795 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 60 × 69 = 4148 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 453 + 671 = 1124 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 34 × 22 = 748 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 756 + 900 = 1656 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 95 × 46 = 4376 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 914 + 313 = 1227 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 34 = 782 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 68 × 87 = 5916 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 327 + 519 = 849 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 407 + 307 = 714 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 16 × 92 = 1472 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 43 × 89 = 3818 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 86 × 48 = 4132 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 83 × 70 = 5810 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 79 × 74 = 5846 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 283 + 587 = 870 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 305 + 655 = 960 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 609 + 133 = 742 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 376 + 242 = 612 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 91 × 32 = 2912 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 86 × 73 = 6278 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 30 × 85 = 2550 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 76 × 76 = 5772 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 56 × 97 = 5432 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 904 + 451 = 1355 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 364 + 142 = 505 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 17 × 41 = 697 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 518 + 487 = 1005 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 22 × 69 = 1510 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 430 + 702 = 1132 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 26 × 61 = 1586 right or wrong? (a) Right (b) Wrong

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