Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 870 · 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 909 + 148 = 1048 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 99 × 55 = 5445 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 75 × 43 = 3225 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 305 + 971 = 1279 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 28 × 78 = 2184 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 620 + 852 = 1467 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 48 × 84 = 4039 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 57 × 36 = 2052 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 30 = 420 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 260 + 460 = 723 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 75 × 86 = 6450 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 92 × 52 = 4784 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 37 × 89 = 3294 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 39 × 70 = 2730 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 222 + 866 = 1088 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 64 × 47 = 3008 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 12 × 84 = 1010 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 542 + 664 = 1209 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 611 + 274 = 885 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 410 + 329 = 744 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 12 × 31 = 363 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 28 × 47 = 1307 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 63 × 51 = 3213 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 742 + 376 = 1118 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 810 + 403 = 1208 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 47 × 93 = 4362 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 906 + 604 = 1510 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 370 + 777 = 1149 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 17 × 29 = 499 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 169 + 833 = 1002 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 89 = 3029 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 480 + 197 = 680 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 34 × 88 = 2992 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 18 = 612 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 20 × 19 = 388 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 779 + 167 = 946 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 72 × 16 = 1152 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 60 × 82 = 4920 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 20 × 48 = 952 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 85 × 95 = 8075 right or wrong? (a) Wrong (b) Right

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