Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 766 · 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 30 × 51 = 1530 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 617 + 185 = 800 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 34 × 67 = 2270 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 91 × 75 = 6825 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 308 + 260 = 567 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 35 × 45 = 1575 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 65 × 55 = 3569 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 94 × 14 = 1316 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 30 = 630 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 72 × 69 = 4968 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 593 + 767 = 1360 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 12 × 19 = 228 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 634 + 606 = 1244 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 270 + 587 = 850 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 187 + 944 = 1129 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 26 × 83 = 2162 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 299 + 394 = 691 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 149 + 648 = 794 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 65 × 81 = 5265 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 13 × 72 = 945 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 16 × 50 = 801 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 382 + 326 = 705 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 18 × 49 = 882 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 84 × 25 = 2100 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 62 × 93 = 5766 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 384 + 784 = 1168 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 489 + 397 = 886 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 123 + 669 = 792 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 489 + 202 = 691 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 64 × 76 = 4864 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 497 + 670 = 1167 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 85 = 2720 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 54 × 26 = 1403 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 199 + 311 = 515 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 275 + 479 = 754 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 71 × 19 = 1349 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 744 + 140 = 884 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 71 × 26 = 1853 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 329 + 830 = 1159 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 185 + 280 = 464 right or wrong? (a) Wrong (b) Right

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