Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 362 · 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 24 × 13 = 312 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 53 = 4346 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 30 × 95 = 2850 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 13 × 97 = 1255 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 482 + 424 = 906 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 237 + 646 = 890 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 253 + 133 = 395 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 23 × 30 = 690 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 53 × 50 = 2646 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 88 × 32 = 2808 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 28 × 44 = 1235 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 19 = 285 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 85 × 24 = 2039 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 77 × 49 = 3773 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 973 + 481 = 1456 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 290 + 382 = 672 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 81 × 64 = 5184 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 118 + 708 = 822 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 850 + 186 = 1036 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 91 × 37 = 3369 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 34 × 66 = 2250 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 33 × 45 = 1485 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 87 × 33 = 2875 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 92 × 72 = 6633 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 44 × 47 = 2077 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 73 × 15 = 1091 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 31 = 930 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 301 + 559 = 860 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 280 + 943 = 1229 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 52 × 37 = 1924 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 638 + 174 = 812 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 514 + 619 = 1130 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 547 + 906 = 1453 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 67 × 57 = 3819 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 23 × 20 = 460 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 88 × 89 = 7832 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 12 × 70 = 834 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 131 + 926 = 1065 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 81 × 33 = 2667 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 614 + 847 = 1461 right or wrong? (a) Wrong (b) Right

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