Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 541 · 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 68 × 90 = 6120 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 114 + 261 = 375 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 459 + 143 = 593 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 780 + 139 = 919 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 42 × 51 = 2142 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 18 × 38 = 684 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 64 × 88 = 5632 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 560 + 976 = 1532 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 84 × 58 = 4867 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 67 × 44 = 2948 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 509 + 591 = 1100 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 23 = 1564 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 29 × 19 = 551 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 893 + 187 = 1077 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 63 = 4788 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 356 + 258 = 614 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 71 = 1709 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 308 + 982 = 1290 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 85 = 4080 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 80 × 24 = 1917 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 168 + 796 = 967 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 63 × 90 = 5670 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 40 = 3000 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 97 × 20 = 1937 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 629 + 280 = 909 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 20 × 87 = 1748 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 18 × 65 = 1170 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 903 + 133 = 1035 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 61 × 15 = 915 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 815 + 677 = 1492 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 909 + 287 = 1196 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 926 + 202 = 1127 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 97 = 7372 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 31 × 83 = 2573 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 14 × 75 = 1050 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 27 × 48 = 1298 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 20 × 92 = 1840 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 252 + 273 = 525 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 338 + 256 = 594 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 55 × 66 = 3630 right or wrong? (a) Right (b) Wrong

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