Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 945 · 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 68 × 13 = 884 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 527 + 727 = 1251 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 242 + 327 = 569 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 745 + 277 = 1022 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 145 + 785 = 929 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 146 + 587 = 731 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 683 + 249 = 932 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 615 + 153 = 773 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 17 × 29 = 493 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 97 × 93 = 9024 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 501 + 837 = 1338 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 925 + 799 = 1728 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 81 = 3483 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 61 × 91 = 5559 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 93 × 88 = 8185 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 93 × 29 = 2697 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 436 + 171 = 607 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 683 + 289 = 972 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 811 + 270 = 1086 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 30 = 420 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 701 + 609 = 1310 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 732 + 675 = 1407 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 71 × 48 = 3408 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 953 + 734 = 1687 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 589 + 835 = 1424 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 76 = 1824 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 944 + 167 = 1117 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 464 + 598 = 1062 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 15 × 59 = 885 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 271 + 876 = 1142 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 51 = 2601 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 662 + 693 = 1355 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 891 + 246 = 1138 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 225 + 114 = 346 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 123 + 450 = 564 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 757 + 915 = 1672 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 706 + 314 = 1016 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 65 × 63 = 4095 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 24 × 43 = 1032 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 61 = 2625 right or wrong? (a) Wrong (b) Right

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