Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 514 · 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 431 + 920 = 1359 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 216 + 132 = 349 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 274 + 813 = 1094 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 92 × 94 = 8648 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 31 × 14 = 431 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 18 × 44 = 792 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 46 × 44 = 2024 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 194 + 884 = 1085 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 273 + 598 = 871 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 61 × 80 = 4880 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 85 × 41 = 3489 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 22 × 14 = 308 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 378 + 167 = 545 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 350 + 828 = 1174 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 31 × 33 = 1016 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 63 × 48 = 3024 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 765 + 751 = 1522 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 36 × 42 = 1512 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 706 + 970 = 1676 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 524 + 155 = 679 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 50 = 900 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 47 × 39 = 1827 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 19 = 570 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 32 × 27 = 871 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 60 × 59 = 3531 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 15 × 77 = 1155 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 964 + 285 = 1243 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 685 + 495 = 1179 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 948 + 912 = 1852 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 285 + 651 = 930 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 19 × 12 = 228 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 478 + 834 = 1312 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 27 × 38 = 1031 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 86 = 2581 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 67 × 45 = 3015 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 39 × 87 = 3393 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 491 + 124 = 615 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 625 + 241 = 866 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 37 × 34 = 1255 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 51 × 63 = 3213 right or wrong? (a) Wrong (b) Right

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