Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 61 · 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 62 × 91 = 5642 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 534 + 869 = 1396 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 36 × 49 = 1764 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 206 + 564 = 772 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 86 × 50 = 4300 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 316 + 326 = 642 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 12 × 58 = 705 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 71 × 64 = 4548 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 832 + 873 = 1705 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 87 × 29 = 2523 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 74 × 98 = 7254 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 43 × 77 = 3311 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 61 × 13 = 793 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 190 + 752 = 942 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 50 × 91 = 4550 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 19 × 62 = 1178 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 365 + 445 = 816 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 56 = 2184 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 64 × 95 = 6080 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 328 + 192 = 514 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 63 × 78 = 4919 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 99 × 61 = 6030 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 18 × 12 = 207 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 21 × 26 = 550 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 55 × 60 = 3304 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 507 + 744 = 1251 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 74 = 2300 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 749 + 426 = 1175 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 18 × 94 = 1692 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 347 + 739 = 1081 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 985 + 832 = 1811 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 507 + 594 = 1101 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 861 + 154 = 1013 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 613 + 901 = 1510 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 25 × 57 = 1425 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 832 + 747 = 1580 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 24 × 91 = 2184 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 80 × 61 = 4879 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 86 × 90 = 7748 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 62 × 73 = 4533 right or wrong? (a) Wrong (b) Right

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