Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 629 · 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 75 × 41 = 3075 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 87 × 37 = 3219 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 52 × 60 = 3120 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 68 × 65 = 4420 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 541 + 638 = 1182 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 58 × 60 = 3471 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 66 × 52 = 3441 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 59 × 35 = 2065 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 12 = 648 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 552 + 816 = 1368 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 12 × 35 = 420 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 871 + 448 = 1327 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 897 + 743 = 1640 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 764 + 280 = 1039 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 69 = 828 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 268 + 532 = 800 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 99 × 62 = 6131 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 87 × 63 = 5487 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 41 × 37 = 1517 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 43 = 1326 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 67 = 1140 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 509 + 843 = 1351 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 58 = 3712 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 900 + 214 = 1110 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 70 × 21 = 1470 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 26 × 17 = 448 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 221 + 678 = 899 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 31 = 1147 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 670 + 259 = 920 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 905 + 281 = 1186 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 14 × 78 = 1092 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 50 × 82 = 4100 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 28 = 753 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 952 + 959 = 1904 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 610 + 294 = 897 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 75 × 34 = 2548 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 34 × 48 = 1636 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 55 × 76 = 4182 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 423 + 798 = 1226 right or wrong? (a) Wrong (b) Right

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