Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 6 · 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 69 × 36 = 2484 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 67 × 40 = 2681 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 83 = 2739 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 753 + 367 = 1125 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 137 + 575 = 719 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 37 × 21 = 777 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 71 × 78 = 5534 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 456 + 814 = 1266 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 13 × 12 = 156 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 868 + 169 = 1031 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 643 + 743 = 1386 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 58 × 85 = 4934 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 515 + 771 = 1294 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 65 × 25 = 1625 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 745 + 301 = 1046 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 55 × 65 = 3575 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 55 × 25 = 1382 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 90 × 89 = 8010 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 932 + 988 = 1926 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 474 + 504 = 978 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 239 + 837 = 1076 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 124 + 869 = 991 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 259 + 853 = 1112 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 80 = 2793 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 184 + 217 = 401 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 721 + 593 = 1314 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 49 × 27 = 1323 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 912 + 320 = 1232 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 35 × 35 = 1225 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 262 + 365 = 627 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 339 + 731 = 1070 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 472 + 473 = 952 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 534 + 365 = 902 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 58 × 17 = 991 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 80 × 56 = 4487 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 203 + 498 = 701 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 417 + 752 = 1169 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 15 = 472 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 55 × 39 = 2145 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 99 × 81 = 8014 right or wrong? (a) Wrong (b) Right

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