Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 254 · 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 340 + 687 = 1027 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 174 + 183 = 349 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 662 + 373 = 1033 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 52 × 97 = 5050 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 99 × 43 = 4257 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 453 + 141 = 594 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 41 × 89 = 3655 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 304 + 665 = 962 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 935 + 175 = 1103 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 443 + 105 = 554 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 59 × 16 = 950 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 26 = 2419 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 71 × 83 = 5901 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 15 × 32 = 480 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 18 × 25 = 447 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 18 = 486 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 74 = 2746 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 994 + 928 = 1922 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 99 × 73 = 7236 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 622 + 310 = 924 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 667 + 223 = 890 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 486 + 698 = 1187 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 847 + 719 = 1566 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 36 × 24 = 864 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 91 × 50 = 4543 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 629 + 263 = 892 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 634 + 745 = 1375 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 900 + 862 = 1762 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 68 = 1836 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 422 + 906 = 1326 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 679 + 901 = 1578 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 92 × 30 = 2760 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 50 × 32 = 1600 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 13 × 29 = 377 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 54 × 30 = 1629 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 15 × 23 = 336 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 79 = 2449 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 94 = 2161 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 297 + 122 = 425 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 56 × 16 = 893 right or wrong? (a) Right (b) Wrong

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