Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 915 · 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 67 × 68 = 4556 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 309 + 984 = 1296 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 350 + 107 = 463 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 941 + 609 = 1550 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 801 + 115 = 912 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 97 × 78 = 7561 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 381 + 291 = 672 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 235 + 808 = 1047 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 208 + 209 = 417 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 33 × 47 = 1542 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 202 + 605 = 809 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 89 = 8277 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 192 + 594 = 786 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 847 + 768 = 1613 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 49 × 17 = 839 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 152 + 582 = 734 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 318 + 148 = 469 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 639 + 847 = 1487 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 850 + 635 = 1487 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 14 × 43 = 607 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 95 × 67 = 6357 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 435 + 294 = 738 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 68 = 2448 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 13 × 30 = 388 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 468 + 397 = 861 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 96 × 96 = 9218 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 766 + 201 = 967 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 241 + 681 = 914 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 41 × 40 = 1640 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 53 × 25 = 1325 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 164 + 387 = 549 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 217 + 583 = 807 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 61 × 23 = 1403 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 366 + 854 = 1218 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 574 + 800 = 1374 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 70 × 77 = 5383 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 46 × 98 = 4504 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 17 × 97 = 1651 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 91 × 97 = 8827 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 64 × 71 = 4540 right or wrong? (a) Right (b) Wrong

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