Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 470 · 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 25 × 86 = 2150 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 58 × 35 = 2030 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 365 + 233 = 598 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 38 × 79 = 2999 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 653 + 405 = 1060 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 225 + 988 = 1213 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 27 × 22 = 594 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 571 + 525 = 1096 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 65 × 19 = 1241 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 19 × 25 = 479 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 19 × 82 = 1557 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 805 + 673 = 1471 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 843 + 773 = 1616 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 110 + 412 = 522 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 15 × 31 = 465 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 781 + 597 = 1378 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 21 = 1999 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 776 + 485 = 1258 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 56 × 21 = 1176 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 98 × 75 = 7343 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 32 × 36 = 1153 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 543 + 374 = 917 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 77 × 76 = 5852 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 913 + 640 = 1553 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 94 × 83 = 7795 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 907 + 486 = 1393 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 20 × 64 = 1280 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 47 × 94 = 4427 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 476 + 137 = 613 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 266 + 266 = 528 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 69 × 87 = 6003 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 55 = 2860 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 79 × 52 = 4108 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 752 + 317 = 1067 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 47 × 59 = 2768 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 43 × 72 = 3096 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 44 × 61 = 2679 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 796 + 969 = 1765 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 26 × 97 = 2526 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 22 × 87 = 1914 right or wrong? (a) Right (b) Wrong

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