Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 277 · 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 13 × 90 = 1170 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 489 + 529 = 1016 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 89 × 97 = 8633 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 82 × 55 = 4505 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 24 × 76 = 1824 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 690 + 357 = 1047 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 405 + 611 = 1016 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 59 = 3486 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 78 × 14 = 1092 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 30 × 26 = 783 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 499 + 316 = 815 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 69 × 16 = 1100 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 314 + 420 = 731 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 301 + 925 = 1226 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 136 + 463 = 605 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 33 × 67 = 2211 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 91 = 2540 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 971 + 134 = 1105 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 688 + 156 = 846 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 22 × 77 = 1690 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 68 = 3468 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 75 × 22 = 1650 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 22 × 61 = 1342 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 183 + 842 = 1023 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 426 + 319 = 745 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 306 + 351 = 657 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 361 + 980 = 1350 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 111 + 293 = 412 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 291 + 832 = 1125 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 43 × 32 = 1376 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 653 + 397 = 1044 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 705 + 268 = 973 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 43 × 44 = 1892 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 18 × 46 = 828 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 12 = 1140 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 12 × 14 = 168 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 52 × 16 = 836 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 35 = 665 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 27 × 62 = 1674 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 64 × 59 = 3768 right or wrong? (a) Right (b) Wrong

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