Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 724 · 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 48 × 33 = 1584 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 602 + 652 = 1262 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 815 + 806 = 1615 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 257 + 420 = 677 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 24 × 60 = 1440 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 27 × 14 = 374 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 49 = 2556 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 792 + 138 = 939 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 79 × 19 = 1501 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 50 × 72 = 3601 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 391 + 189 = 583 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 71 × 22 = 1567 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 176 + 605 = 781 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 35 = 2275 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 141 + 450 = 591 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 137 + 956 = 1097 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 82 = 2949 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 45 = 3150 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 415 + 482 = 893 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 15 × 15 = 218 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 49 × 95 = 4653 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 449 + 932 = 1381 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 44 × 65 = 2860 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 265 + 986 = 1250 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 375 + 212 = 584 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 465 + 885 = 1349 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 26 × 13 = 336 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 81 × 58 = 4698 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 88 × 13 = 1146 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 85 × 37 = 3140 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 909 + 680 = 1589 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 783 + 498 = 1287 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 67 = 2336 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 75 × 14 = 1050 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 67 = 6564 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 27 × 32 = 864 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 73 × 47 = 3431 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 44 = 1012 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 147 + 253 = 400 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 29 × 59 = 1711 right or wrong? (a) Right (b) Wrong

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