Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 988 · 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 793 + 683 = 1471 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 463 + 942 = 1404 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 118 + 327 = 443 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 94 × 51 = 4794 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 403 + 486 = 889 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 18 × 14 = 255 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 913 + 912 = 1825 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 33 × 77 = 2537 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 215 + 317 = 532 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 67 = 1474 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 248 + 310 = 553 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 23 = 810 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 691 + 722 = 1415 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 28 × 39 = 1099 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 767 + 855 = 1622 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 865 + 604 = 1469 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 634 + 218 = 852 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 30 × 43 = 1288 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 181 + 803 = 984 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 589 + 766 = 1355 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 35 × 29 = 1015 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 91 × 94 = 8557 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 94 × 65 = 6102 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 35 × 38 = 1337 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 88 × 31 = 2726 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 322 + 730 = 1052 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 21 × 36 = 757 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 67 × 56 = 3754 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 473 + 169 = 642 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 549 + 435 = 984 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 67 × 75 = 5025 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 137 + 568 = 713 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 54 × 80 = 4324 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 310 + 709 = 1019 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 531 + 166 = 703 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 314 + 775 = 1089 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 899 + 404 = 1303 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 248 + 705 = 949 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 148 + 317 = 465 right or wrong? (a) Wrong (b) Right

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