Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 393 · 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 92 × 45 = 4145 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 139 + 240 = 379 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 785 + 132 = 917 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 84 × 93 = 7820 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 320 + 273 = 602 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 877 + 827 = 1699 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 323 + 206 = 529 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 808 + 409 = 1214 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 490 + 459 = 941 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 23 × 17 = 391 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 83 × 42 = 3479 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 546 + 900 = 1440 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 167 + 388 = 549 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 54 × 31 = 1669 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 634 + 851 = 1485 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 81 = 1051 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 175 + 973 = 1151 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 79 × 87 = 6873 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 412 + 856 = 1270 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 301 + 390 = 692 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 78 × 32 = 2493 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 381 + 829 = 1210 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 64 × 48 = 3072 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 39 × 37 = 1443 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 63 × 27 = 1701 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 16 × 13 = 206 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 41 × 14 = 574 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 982 + 861 = 1849 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 27 × 45 = 1215 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 876 + 974 = 1848 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 50 = 1700 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 44 × 14 = 617 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 60 × 48 = 2880 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 460 + 903 = 1363 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 48 × 16 = 768 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 67 × 99 = 6633 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 250 + 818 = 1071 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 994 + 983 = 1977 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 255 + 964 = 1214 right or wrong? (a) Wrong (b) Right

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