Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 776 · 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 43 × 62 = 2674 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 739 + 664 = 1400 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 330 + 620 = 955 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 63 × 26 = 1642 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 33 × 24 = 788 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 888 + 867 = 1747 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 720 + 602 = 1325 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 85 × 85 = 7221 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 83 × 27 = 2242 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 404 + 278 = 682 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 439 + 497 = 928 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 49 × 34 = 1666 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 15 × 76 = 1140 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 814 + 810 = 1624 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 75 × 96 = 7200 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 97 × 15 = 1455 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 903 + 726 = 1633 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 953 + 642 = 1597 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 503 + 411 = 917 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 592 + 956 = 1548 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 180 + 286 = 473 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 14 = 378 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 266 + 306 = 572 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 888 + 789 = 1677 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 74 × 31 = 2295 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 831 + 114 = 942 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 48 × 17 = 816 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 473 + 793 = 1266 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 68 × 51 = 3459 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 655 + 584 = 1233 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 24 × 70 = 1680 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 30 × 84 = 2520 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 122 + 932 = 1054 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 794 + 292 = 1095 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 786 + 744 = 1530 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 96 × 37 = 3555 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 25 × 72 = 1800 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 606 + 750 = 1353 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 23 × 82 = 1886 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 50 = 2343 right or wrong? (a) Right (b) Wrong

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