Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 182 · 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 71 × 20 = 1420 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 206 + 347 = 556 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 446 + 129 = 575 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 21 × 35 = 729 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 512 + 693 = 1205 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 54 × 39 = 2100 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 449 + 809 = 1260 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 64 × 19 = 1216 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 358 + 859 = 1217 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 87 × 18 = 1566 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 35 × 97 = 3395 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 23 × 64 = 1479 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 872 + 639 = 1511 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 49 × 54 = 2652 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 93 × 53 = 4929 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 34 × 28 = 961 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 28 × 81 = 2272 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 31 × 38 = 1174 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 63 × 65 = 4095 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 847 + 601 = 1448 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 30 × 67 = 2010 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 228 + 492 = 721 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 18 × 68 = 1224 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 21 × 55 = 1153 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 27 × 64 = 1728 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 279 + 622 = 901 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 40 × 32 = 1288 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 122 + 938 = 1060 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 56 = 2072 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 37 × 23 = 851 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 20 × 37 = 740 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 73 × 58 = 4234 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 348 + 481 = 829 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 838 + 205 = 1042 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 139 + 548 = 687 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 90 × 68 = 6128 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 89 × 41 = 3649 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 55 × 65 = 3576 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 12 × 32 = 384 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 14 × 21 = 287 right or wrong? (a) Right (b) Wrong

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