Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 299 · 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 97 × 69 = 6693 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 99 × 69 = 6833 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 40 × 27 = 1080 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 471 + 275 = 746 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 249 + 381 = 623 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 32 × 89 = 2844 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 461 + 773 = 1231 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 33 × 96 = 3168 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 929 + 922 = 1851 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 48 × 28 = 1344 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 25 × 23 = 570 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 817 + 745 = 1562 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 796 + 672 = 1464 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 95 × 51 = 4843 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 689 + 916 = 1608 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 482 + 443 = 925 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 466 + 861 = 1336 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 318 + 970 = 1288 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 98 × 78 = 7651 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 321 + 494 = 815 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 458 + 953 = 1411 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 81 × 83 = 6723 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 817 + 306 = 1123 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 88 × 53 = 4664 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 17 × 12 = 204 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 79 × 78 = 6153 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 456 + 996 = 1456 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 27 × 17 = 459 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 95 = 2565 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 84 × 69 = 5796 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 54 × 95 = 5130 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 790 + 980 = 1777 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 921 + 162 = 1076 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 137 + 296 = 428 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 87 × 33 = 2880 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 610 + 149 = 750 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 58 × 97 = 5626 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 799 + 325 = 1124 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 303 + 654 = 957 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 235 + 564 = 799 right or wrong? (a) Right (b) Wrong

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