Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 669 · 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 79 × 51 = 4032 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 607 + 239 = 846 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 268 + 514 = 779 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 261 + 968 = 1229 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 39 × 81 = 3159 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 57 × 54 = 3078 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 87 × 39 = 3394 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 164 + 986 = 1151 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 22 × 50 = 1108 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 15 = 444 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 45 × 40 = 1807 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 561 + 560 = 1121 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 811 + 933 = 1744 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 264 + 871 = 1135 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 560 + 913 = 1473 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 302 + 254 = 556 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 813 + 608 = 1421 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 53 × 95 = 5035 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 88 × 46 = 4048 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 62 = 2294 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 57 × 20 = 1145 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 30 × 28 = 840 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 665 + 605 = 1270 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 246 + 545 = 790 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 28 × 93 = 2604 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 911 + 182 = 1094 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 55 × 70 = 3850 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 389 + 261 = 650 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 224 + 249 = 473 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 948 + 378 = 1318 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 690 + 815 = 1506 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 204 + 266 = 476 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 23 × 26 = 598 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 72 × 46 = 3314 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 773 + 945 = 1713 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 207 + 863 = 1070 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 94 = 3290 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 47 × 46 = 2162 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 715 + 287 = 1002 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 968 + 746 = 1713 right or wrong? (a) Wrong (b) Right

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