Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 204 · 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 51 × 59 = 3009 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 27 × 93 = 2519 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 90 = 3150 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 19 × 96 = 1824 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 435 + 394 = 829 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 131 + 720 = 851 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 62 × 57 = 3534 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 82 × 36 = 2952 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 15 × 52 = 780 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 363 + 376 = 739 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 700 + 404 = 1104 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 206 + 983 = 1189 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 716 + 588 = 1304 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 181 + 913 = 1092 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 34 × 44 = 1496 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 54 × 26 = 1404 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 216 + 324 = 538 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 44 = 1232 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 41 × 45 = 1845 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 46 × 92 = 4229 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 168 + 556 = 722 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 891 + 439 = 1330 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 98 × 78 = 7644 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 960 + 631 = 1587 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 26 × 28 = 728 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 19 × 42 = 798 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 333 + 311 = 642 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 41 × 92 = 3772 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 14 × 85 = 1190 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 44 = 3257 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 63 × 14 = 891 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 55 × 44 = 2420 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 256 + 791 = 1047 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 86 × 48 = 4134 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 466 + 272 = 743 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 70 × 66 = 4620 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 440 + 580 = 1020 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 84 × 78 = 6552 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 810 + 862 = 1672 right or wrong? (a) Right (b) Wrong

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