Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 825 · 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 49 × 93 = 4552 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 26 × 54 = 1404 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 359 + 443 = 802 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 73 × 51 = 3720 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 35 × 36 = 1260 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 12 = 233 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 86 × 33 = 2844 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 19 = 950 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 219 + 894 = 1113 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 504 + 374 = 874 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 31 = 586 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 473 + 908 = 1384 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 77 × 49 = 3773 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 29 = 783 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 95 × 38 = 3610 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 87 × 13 = 1131 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 354 + 888 = 1242 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 37 × 75 = 2771 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 30 × 29 = 870 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 26 × 13 = 338 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 577 + 275 = 850 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 17 = 550 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 87 × 36 = 3132 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 41 = 1763 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 207 + 705 = 918 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 183 + 179 = 355 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 775 + 300 = 1075 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 70 × 34 = 2380 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 74 × 99 = 7326 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 21 × 46 = 966 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 17 × 54 = 910 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 51 × 85 = 4335 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 33 = 660 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 978 + 649 = 1631 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 517 + 145 = 662 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 17 × 75 = 1282 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 80 = 1997 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 22 × 46 = 1014 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 31 × 86 = 2663 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 89 × 32 = 2848 right or wrong? (a) Right (b) Wrong

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