Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 644 · 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 14 × 29 = 406 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 16 × 44 = 704 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 25 = 925 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 42 × 45 = 1889 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 34 × 42 = 1428 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 572 + 870 = 1447 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 875 + 110 = 984 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 54 × 38 = 2052 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 29 × 40 = 1160 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 24 × 65 = 1560 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 791 + 190 = 990 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 211 + 415 = 624 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 269 + 387 = 649 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 829 + 776 = 1607 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 217 + 184 = 393 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 51 × 42 = 2134 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 71 × 12 = 852 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 173 + 294 = 467 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 76 × 54 = 4099 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 579 + 973 = 1550 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 916 + 443 = 1359 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 176 + 844 = 1013 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 237 + 995 = 1232 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 715 + 413 = 1133 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 45 × 40 = 1800 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 917 + 181 = 1101 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 532 + 898 = 1436 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 286 + 974 = 1255 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 19 × 60 = 1141 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 41 × 18 = 738 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 518 + 369 = 887 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 698 + 225 = 921 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 34 = 918 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 687 + 349 = 1029 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 378 + 724 = 1106 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 47 × 40 = 1880 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 81 × 73 = 5909 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 42 = 878 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 187 + 904 = 1091 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 36 × 20 = 720 right or wrong? (a) Right (b) Wrong

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