Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 843 · 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 411 + 271 = 682 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 927 + 369 = 1294 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 671 + 905 = 1576 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 745 + 755 = 1496 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 585 + 773 = 1359 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 57 × 85 = 4837 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 373 + 615 = 988 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 54 × 49 = 2646 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 644 + 619 = 1263 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 22 × 52 = 1144 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 41 × 74 = 3034 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 274 + 265 = 539 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 38 × 99 = 3771 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 19 × 59 = 1125 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 790 + 656 = 1446 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 61 × 31 = 1897 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 61 × 43 = 2623 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 525 + 464 = 989 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 791 + 640 = 1436 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 77 × 38 = 2926 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 631 + 325 = 958 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 31 × 87 = 2690 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 59 × 72 = 4248 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 31 × 81 = 2511 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 105 + 180 = 285 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 335 + 141 = 476 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 46 = 3772 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 49 = 3234 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 967 + 994 = 1961 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 43 × 64 = 2752 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 977 + 396 = 1373 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 89 × 34 = 3026 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 46 × 61 = 2801 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 40 × 18 = 726 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 936 + 308 = 1251 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 67 × 97 = 6499 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 616 + 273 = 894 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 47 = 1965 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 21 × 90 = 1899 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 50 × 29 = 1450 right or wrong? (a) Right (b) Wrong

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