Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 933 · 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 21 × 73 = 1533 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 259 + 992 = 1251 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 27 = 1809 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 43 × 36 = 1542 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 605 + 126 = 726 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 93 × 14 = 1302 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 659 + 472 = 1137 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 215 + 492 = 698 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 369 + 759 = 1128 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 683 + 158 = 842 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 119 + 737 = 859 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 368 + 450 = 814 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 339 + 418 = 757 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 68 × 96 = 6528 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 276 + 945 = 1221 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 287 + 333 = 612 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 86 × 20 = 1729 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 22 × 39 = 855 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 532 + 481 = 1013 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 132 + 768 = 901 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 931 + 346 = 1269 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 85 × 21 = 1787 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 512 + 513 = 1025 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 85 × 66 = 5605 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 21 = 1245 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 642 + 691 = 1333 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 280 + 377 = 657 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 46 × 57 = 2622 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 576 + 833 = 1409 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 85 × 12 = 1011 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 439 + 230 = 669 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 44 × 64 = 2810 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 65 × 16 = 1032 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 197 + 431 = 620 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 78 × 97 = 7569 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 67 × 55 = 3678 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 95 × 12 = 1140 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 340 + 905 = 1242 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 291 + 155 = 441 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 148 + 450 = 598 right or wrong? (a) Right (b) Wrong

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