Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 424 · 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 70 × 68 = 4757 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 39 × 61 = 2388 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 36 × 38 = 1368 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 731 + 215 = 946 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 17 × 66 = 1122 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 811 + 394 = 1206 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 847 + 438 = 1285 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 450 + 763 = 1213 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 62 × 85 = 5271 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 231 + 605 = 833 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 319 + 349 = 672 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 194 + 883 = 1077 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 44 = 2513 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 84 × 24 = 2023 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 97 × 42 = 4074 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 224 + 314 = 542 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 23 × 35 = 805 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 54 = 3556 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 35 × 55 = 1925 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 79 × 52 = 4107 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 31 × 30 = 930 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 527 + 348 = 877 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 58 × 41 = 2378 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 541 + 296 = 846 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 14 × 53 = 739 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 349 + 714 = 1063 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 956 + 671 = 1627 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 562 + 355 = 912 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 361 + 670 = 1036 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 574 + 663 = 1242 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 293 + 653 = 952 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 379 + 451 = 831 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 84 × 99 = 8321 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 318 + 536 = 852 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 354 + 744 = 1098 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 94 = 2726 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 48 × 93 = 4464 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 722 + 930 = 1652 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 25 × 25 = 625 right or wrong? (a) Wrong (b) Right

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