Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 218 · 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 64 × 41 = 2624 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 179 + 534 = 713 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 85 × 42 = 3569 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 362 + 266 = 628 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 71 × 42 = 2983 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 340 + 475 = 815 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 74 × 28 = 2077 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 72 × 81 = 5832 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 26 × 97 = 2514 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 46 × 77 = 3541 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 601 + 581 = 1176 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 60 × 31 = 1854 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 41 × 13 = 536 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 15 × 25 = 375 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 73 × 42 = 3066 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 214 + 906 = 1120 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 566 + 669 = 1236 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 21 × 26 = 546 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 45 × 75 = 3375 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 692 + 755 = 1450 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 815 + 960 = 1775 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 33 × 92 = 3039 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 919 + 281 = 1200 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 609 + 923 = 1538 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 857 + 810 = 1665 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 90 = 2964 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 58 × 92 = 5338 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 98 × 29 = 2842 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 881 + 352 = 1224 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 84 × 34 = 2856 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 68 × 46 = 3123 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 122 + 694 = 816 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 405 + 242 = 641 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 539 + 484 = 1026 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 90 × 79 = 7110 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 30 × 81 = 2427 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 585 + 786 = 1369 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 38 × 15 = 568 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 68 × 53 = 3610 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 85 × 50 = 4246 right or wrong? (a) Right (b) Wrong

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