Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 900 · 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 922 + 839 = 1761 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 73 × 67 = 4891 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 417 + 548 = 965 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 338 + 962 = 1307 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 383 + 741 = 1124 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 40 × 58 = 2324 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 193 + 803 = 996 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 44 = 844 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 679 + 423 = 1102 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 168 + 715 = 883 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 53 × 21 = 1116 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 66 × 61 = 4026 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 22 × 52 = 1144 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 462 + 711 = 1164 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 909 + 183 = 1090 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 258 + 126 = 391 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 734 + 258 = 992 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 33 = 792 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 936 + 280 = 1210 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 26 × 69 = 1794 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 86 × 76 = 6536 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 75 × 27 = 2016 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 72 = 2520 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 12 × 36 = 424 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 499 + 467 = 965 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 695 + 163 = 858 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 641 + 950 = 1598 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 37 × 33 = 1221 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 782 + 172 = 950 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 70 × 50 = 3500 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 165 + 801 = 966 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 67 × 71 = 4761 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 82 × 48 = 3936 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 187 + 215 = 401 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 45 × 97 = 4364 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 517 + 632 = 1149 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 97 × 36 = 3498 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 26 × 23 = 598 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 734 + 404 = 1143 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 447 + 773 = 1227 right or wrong? (a) Right (b) Wrong

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