Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 38 · 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 55 × 37 = 2035 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 65 × 53 = 3445 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 50 × 30 = 1503 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 17 × 62 = 1062 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 544 + 594 = 1143 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 131 + 113 = 244 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 16 × 65 = 1032 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 752 + 272 = 1024 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 12 × 85 = 1020 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 92 × 99 = 9099 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 719 + 115 = 837 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 57 × 78 = 4448 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 416 + 739 = 1155 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 282 + 227 = 511 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 755 + 416 = 1171 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 56 × 90 = 5040 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 21 × 37 = 777 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 718 + 915 = 1642 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 50 × 16 = 797 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 88 × 55 = 4836 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 98 × 36 = 3525 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 172 + 244 = 416 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 48 × 60 = 2871 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 71 × 53 = 3762 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 64 × 34 = 2170 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 91 × 94 = 8554 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 65 = 5000 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 878 + 123 = 1001 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 34 × 53 = 1802 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 45 × 95 = 4275 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 199 + 268 = 467 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 150 + 391 = 533 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 62 × 70 = 4349 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 88 = 2288 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 86 × 95 = 8165 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 21 × 92 = 1933 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 663 + 426 = 1089 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 246 + 452 = 705 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 24 × 68 = 1632 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 34 × 91 = 3095 right or wrong? (a) Right (b) Wrong

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