Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 896 · 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 23 × 71 = 1640 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 836 + 915 = 1751 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 69 × 75 = 5175 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 77 × 51 = 3927 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 93 × 65 = 6050 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 99 × 60 = 5940 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 35 × 52 = 1820 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 45 = 2160 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 553 + 252 = 805 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 394 + 350 = 746 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 20 × 98 = 1961 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 25 × 44 = 1100 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 350 + 822 = 1172 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 661 + 615 = 1276 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 39 × 35 = 1365 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 207 + 711 = 922 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 336 + 922 = 1258 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 59 × 13 = 767 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 648 + 395 = 1043 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 823 + 534 = 1360 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 499 + 227 = 726 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 665 + 882 = 1547 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 795 + 369 = 1164 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 53 × 37 = 1952 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 52 × 58 = 3016 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 951 + 186 = 1129 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 93 × 27 = 2514 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 801 + 309 = 1110 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 65 × 37 = 2406 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 271 + 378 = 656 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 97 × 67 = 6499 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 61 × 68 = 4148 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 88 × 71 = 6249 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 52 × 57 = 2964 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 66 × 77 = 5088 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 40 × 30 = 1200 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 69 × 91 = 6277 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 634 + 893 = 1525 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 20 × 82 = 1640 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 404 + 331 = 737 right or wrong? (a) Wrong (b) Right

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