Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 866 · 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 65 × 88 = 5727 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 74 = 1406 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 47 × 26 = 1222 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 35 × 86 = 3010 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 12 × 67 = 804 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 99 × 95 = 9405 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 175 + 417 = 599 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 12 × 65 = 780 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 852 + 485 = 1336 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 295 + 419 = 714 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 307 + 762 = 1069 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 66 × 13 = 858 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 29 × 67 = 1943 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 914 + 283 = 1197 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 297 + 526 = 823 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 382 + 763 = 1136 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 60 × 53 = 3177 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 58 × 81 = 4703 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 20 × 15 = 300 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 99 × 40 = 3963 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 52 × 47 = 2444 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 900 + 318 = 1217 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 242 + 627 = 869 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 49 × 62 = 3032 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 39 × 37 = 1438 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 37 × 34 = 1258 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 17 = 1071 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 72 × 47 = 3384 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 85 × 43 = 3655 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 67 = 1608 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 273 + 826 = 1099 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 351 + 806 = 1157 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 561 + 392 = 945 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 76 × 16 = 1216 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 855 + 321 = 1173 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 546 + 114 = 660 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 145 + 679 = 824 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 874 + 158 = 1032 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 45 × 86 = 3870 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 127 + 294 = 420 right or wrong? (a) Right (b) Wrong

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