Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 225 · 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 50 × 85 = 4250 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 31 × 16 = 496 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 46 × 80 = 3680 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 556 + 175 = 731 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 89 × 60 = 5340 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 81 × 33 = 2673 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 30 × 42 = 1256 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 51 × 69 = 3519 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 44 × 99 = 4356 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 154 + 444 = 598 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 98 × 55 = 5390 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 25 × 18 = 450 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 66 × 66 = 4354 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 859 + 932 = 1797 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 45 × 58 = 2610 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 68 × 34 = 2315 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 60 × 31 = 1860 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 407 + 425 = 832 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 124 + 694 = 817 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 67 × 93 = 6224 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 603 + 394 = 997 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 27 × 20 = 531 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 136 + 616 = 752 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 26 × 57 = 1479 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 323 + 853 = 1176 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 85 × 97 = 8245 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 88 × 41 = 3608 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 759 + 792 = 1551 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 13 × 86 = 1111 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 219 + 343 = 559 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 46 × 85 = 3901 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 27 × 91 = 2457 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 77 × 90 = 6930 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 24 = 648 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 307 + 180 = 487 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 42 × 12 = 504 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 169 + 636 = 800 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 98 × 19 = 1857 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 60 × 47 = 2820 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 69 × 35 = 2410 right or wrong? (a) Wrong (b) Right

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