Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 522 · 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 337 + 146 = 483 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 44 × 26 = 1144 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 34 × 60 = 2031 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 45 × 22 = 984 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 395 + 961 = 1356 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 48 = 1008 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 360 + 227 = 585 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 116 + 479 = 595 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 97 × 87 = 8447 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 51 = 3774 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 156 + 523 = 679 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 67 × 83 = 5561 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 793 + 871 = 1664 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 32 × 76 = 2424 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 52 = 5044 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 449 + 374 = 823 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 82 × 39 = 3193 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 98 × 98 = 9596 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 60 × 32 = 1920 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 36 × 90 = 3240 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 633 + 600 = 1233 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 538 + 386 = 924 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 547 + 947 = 1494 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 845 + 158 = 1003 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 266 + 304 = 570 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 521 + 804 = 1322 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 98 = 9399 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 24 × 84 = 2011 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 167 + 883 = 1050 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 75 × 14 = 1050 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 31 × 47 = 1463 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 840 + 395 = 1235 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 207 + 673 = 875 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 28 × 96 = 2696 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 81 × 16 = 1296 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 28 × 55 = 1540 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 50 × 39 = 1950 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 192 + 469 = 661 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 64 × 68 = 4352 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 380 + 995 = 1384 right or wrong? (a) Right (b) Wrong

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