Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 196 · 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 27 × 50 = 1355 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 69 = 5658 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 966 + 955 = 1921 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 37 × 31 = 1139 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 79 × 20 = 1572 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 73 × 91 = 6638 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 644 + 651 = 1295 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 61 × 98 = 5978 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 86 = 2580 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 86 × 48 = 4126 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 31 × 41 = 1266 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 679 + 897 = 1576 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 422 + 819 = 1241 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 76 = 1976 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 30 × 24 = 721 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 726 + 524 = 1255 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 703 + 347 = 1050 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 69 = 4071 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 549 + 208 = 757 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 247 + 817 = 1064 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 47 × 37 = 1746 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 762 + 325 = 1087 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 85 × 13 = 1108 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 258 + 424 = 682 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 85 = 5360 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 13 = 424 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 503 + 873 = 1383 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 39 × 95 = 3705 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 61 × 35 = 2144 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 555 + 675 = 1230 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 132 + 700 = 832 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 542 + 837 = 1372 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 125 + 367 = 492 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 485 + 207 = 692 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 57 × 34 = 1938 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 52 × 35 = 1820 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 599 + 301 = 894 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 127 + 478 = 596 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 524 + 173 = 697 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 737 + 576 = 1313 right or wrong? (a) Wrong (b) Right

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