Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 195 · 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 99 × 77 = 7627 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 515 + 864 = 1385 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 31 × 82 = 2542 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 20 × 58 = 1160 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 753 + 489 = 1242 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 281 + 465 = 746 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 22 × 64 = 1408 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 93 × 93 = 8649 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 860 + 763 = 1623 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 937 + 554 = 1498 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 363 + 177 = 549 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 716 + 357 = 1073 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 873 + 349 = 1222 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 191 + 252 = 440 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 30 × 32 = 960 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 55 × 29 = 1595 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 48 × 20 = 958 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 275 + 241 = 517 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 58 × 37 = 2146 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 730 + 949 = 1679 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 12 × 31 = 372 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 428 + 587 = 1011 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 97 × 42 = 4074 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 534 + 429 = 956 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 441 + 316 = 748 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 34 = 913 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 72 × 91 = 6555 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 82 × 95 = 7797 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 35 × 95 = 3325 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 89 = 2314 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 29 × 34 = 985 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 756 + 560 = 1316 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 137 + 862 = 1001 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 97 × 83 = 8042 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 16 × 62 = 983 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 590 + 412 = 994 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 84 × 26 = 2184 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 52 × 33 = 1717 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 409 + 619 = 1037 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 995 + 271 = 1266 right or wrong? (a) Wrong (b) Right

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