Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 274 · 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 227 + 972 = 1196 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 68 = 1092 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 50 × 27 = 1353 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 14 = 1120 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 827 + 462 = 1292 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 98 × 26 = 2548 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 86 × 72 = 6197 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 50 = 2500 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 505 + 404 = 909 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 51 × 35 = 1785 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 534 + 110 = 642 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 894 + 454 = 1348 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 748 + 305 = 1044 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 40 × 22 = 873 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 70 × 51 = 3578 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 30 = 2943 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 247 + 559 = 806 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 97 × 40 = 3877 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 410 + 732 = 1142 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 86 × 20 = 1715 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 252 + 673 = 929 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 281 + 417 = 698 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 54 = 2157 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 73 × 16 = 1163 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 979 + 315 = 1294 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 23 × 47 = 1081 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 82 × 94 = 7700 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 797 + 300 = 1097 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 998 + 961 = 1959 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 125 + 808 = 933 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 70 × 85 = 5953 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 271 + 984 = 1249 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 498 + 135 = 625 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 86 × 73 = 6278 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 91 × 73 = 6643 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 46 × 31 = 1434 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 68 × 74 = 5032 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 997 + 592 = 1589 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 957 + 795 = 1750 right or wrong? (a) Wrong (b) Right

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