Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 66 · 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 833 + 678 = 1502 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 433 + 621 = 1054 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 54 × 21 = 1138 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 42 × 80 = 3360 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 12 × 55 = 658 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 60 × 16 = 960 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 80 × 23 = 1840 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 593 + 159 = 752 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 95 × 19 = 1805 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 56 × 53 = 2968 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 23 × 34 = 773 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 548 + 571 = 1119 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 590 + 167 = 757 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 85 × 57 = 4849 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 85 × 94 = 7982 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 267 + 958 = 1230 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 84 × 25 = 2101 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 635 + 330 = 961 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 316 + 631 = 956 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 94 × 75 = 7050 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 412 + 438 = 849 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 874 + 798 = 1672 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 283 + 298 = 572 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 314 + 840 = 1154 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 892 + 660 = 1553 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 899 + 534 = 1433 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 539 + 186 = 725 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 286 + 302 = 588 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 91 × 75 = 6831 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 51 × 54 = 2754 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 66 × 45 = 2974 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 247 + 619 = 866 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 716 + 319 = 1032 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 15 × 90 = 1350 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 24 × 42 = 1010 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 78 × 80 = 6240 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 92 × 95 = 8740 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 71 × 35 = 2485 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 45 × 21 = 943 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 275 + 349 = 624 right or wrong? (a) Right (b) Wrong

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