Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 30 · 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 76 × 53 = 4028 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 90 × 28 = 2520 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 590 + 551 = 1144 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 634 + 703 = 1337 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 48 × 16 = 774 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 91 = 1919 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 820 + 994 = 1814 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 17 × 53 = 893 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 795 + 194 = 989 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 751 + 798 = 1546 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 511 + 785 = 1296 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 821 + 713 = 1542 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 66 × 48 = 3168 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 68 × 50 = 3400 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 14 × 28 = 391 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 398 + 633 = 1031 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 82 = 3938 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 306 + 881 = 1187 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 43 × 64 = 2752 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 228 + 859 = 1081 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 23 × 39 = 899 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 85 × 41 = 3487 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 554 + 141 = 694 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 59 = 2367 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 89 × 75 = 6680 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 147 + 270 = 409 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 16 × 28 = 448 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 938 + 182 = 1120 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 19 × 31 = 581 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 57 × 15 = 855 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 531 + 324 = 851 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 58 × 67 = 3881 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 36 × 55 = 1974 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 255 + 418 = 668 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 83 × 17 = 1411 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 35 = 1925 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 50 × 23 = 1147 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 54 × 47 = 2538 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 90 × 23 = 2066 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 83 = 2078 right or wrong? (a) Right (b) Wrong

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