Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 429 · 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 901 + 171 = 1072 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 486 + 516 = 1002 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 868 + 834 = 1702 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 401 + 325 = 717 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 57 × 71 = 4047 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 91 × 63 = 5733 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 874 + 629 = 1506 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 83 × 64 = 5304 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 71 × 20 = 1417 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 80 × 25 = 2000 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 327 + 296 = 623 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 207 + 593 = 800 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 80 × 51 = 4086 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 300 + 312 = 612 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 530 + 884 = 1414 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 51 × 24 = 1224 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 957 + 274 = 1231 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 747 + 423 = 1170 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 58 × 34 = 1972 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 757 + 573 = 1337 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 33 × 57 = 1881 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 48 = 1200 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 54 × 52 = 2808 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 99 × 37 = 3671 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 43 × 27 = 1161 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 33 × 29 = 966 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 650 + 255 = 901 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 98 × 41 = 4018 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 48 × 25 = 1200 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 448 + 987 = 1428 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 30 × 15 = 450 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 81 × 76 = 6162 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 143 + 939 = 1082 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 71 × 40 = 2840 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 52 × 61 = 3174 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 23 = 1331 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 753 + 153 = 897 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 918 + 203 = 1121 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 28 × 23 = 640 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 949 + 124 = 1071 right or wrong? (a) Right (b) Wrong

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