Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 952 · 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 45 × 95 = 4275 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 88 × 85 = 7480 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 139 + 382 = 521 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 71 × 26 = 1846 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 62 × 15 = 930 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 787 + 468 = 1255 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 82 × 72 = 5909 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 14 × 98 = 1379 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 380 + 656 = 1030 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 27 × 91 = 2449 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 29 = 1073 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 301 + 507 = 807 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 123 + 500 = 619 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 79 × 14 = 1106 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 975 + 474 = 1456 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 77 × 94 = 7238 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 305 + 291 = 596 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 32 × 68 = 2179 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 19 × 69 = 1311 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 973 + 997 = 1966 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 41 × 28 = 1148 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 470 + 739 = 1207 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 874 + 361 = 1235 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 89 × 34 = 3026 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 32 × 31 = 985 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 228 + 339 = 567 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 197 + 438 = 628 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 55 × 92 = 5059 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 892 + 256 = 1147 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 954 + 313 = 1267 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 495 + 847 = 1342 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 65 × 29 = 1878 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 25 × 72 = 1800 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 17 × 46 = 782 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 813 + 157 = 967 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 67 = 1876 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 41 × 50 = 2050 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 15 = 1011 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 654 + 660 = 1308 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 46 × 60 = 2753 right or wrong? (a) Right (b) Wrong

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