Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 684 · 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 28 × 59 = 1649 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 211 + 736 = 947 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 14 × 47 = 658 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 57 = 5073 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 428 + 889 = 1323 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 65 × 16 = 1040 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 245 + 763 = 1009 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 672 + 661 = 1333 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 381 + 825 = 1215 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 272 + 167 = 439 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 276 + 951 = 1227 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 939 + 725 = 1664 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 152 + 715 = 875 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 719 + 240 = 959 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 92 × 20 = 1840 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 13 × 34 = 442 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 956 + 731 = 1687 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 932 + 657 = 1589 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 26 × 49 = 1267 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 38 × 62 = 2349 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 92 × 88 = 8096 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 59 × 93 = 5487 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 31 × 40 = 1241 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 238 + 316 = 554 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 86 = 4823 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 142 + 224 = 375 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 733 + 722 = 1452 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 802 + 653 = 1455 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 74 × 96 = 7104 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 37 × 96 = 3552 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 93 = 3348 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 524 + 745 = 1267 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 74 × 50 = 3705 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 47 × 50 = 2346 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 20 × 93 = 1864 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 33 × 91 = 3000 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 255 + 808 = 1063 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 38 × 73 = 2771 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 279 + 470 = 744 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 61 × 56 = 3416 right or wrong? (a) Right (b) Wrong

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