Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 932 · 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 32 × 82 = 2624 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 23 × 78 = 1785 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 755 + 779 = 1534 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 37 × 26 = 962 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 88 × 42 = 3696 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 50 × 29 = 1450 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 14 × 60 = 843 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 140 + 882 = 1022 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 86 = 1204 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 35 × 95 = 3333 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 84 × 70 = 5880 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 58 × 20 = 1159 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 58 × 84 = 4872 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 81 × 99 = 8016 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 380 + 936 = 1323 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 58 × 12 = 704 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 337 + 487 = 823 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 73 × 48 = 3510 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 932 + 969 = 1895 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 530 + 347 = 868 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 19 × 29 = 551 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 88 × 37 = 3247 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 449 + 449 = 898 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 767 + 224 = 984 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 37 × 39 = 1449 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 32 × 66 = 2112 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 50 × 18 = 908 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 56 × 51 = 2854 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 12 × 15 = 180 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 746 + 884 = 1630 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 12 × 74 = 890 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 53 × 22 = 1161 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 78 × 71 = 5538 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 58 × 91 = 5269 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 661 + 390 = 1060 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 186 + 965 = 1151 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 535 + 819 = 1346 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 713 + 717 = 1430 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 917 + 402 = 1319 right or wrong? (a) Wrong (b) Right

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