Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 618 · 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 874 + 171 = 1045 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 60 × 71 = 4252 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 87 × 39 = 3397 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 13 × 74 = 962 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 614 + 775 = 1389 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 883 + 381 = 1264 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 641 + 405 = 1045 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 311 + 554 = 863 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 715 + 716 = 1431 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 388 + 665 = 1053 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 18 × 24 = 436 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 389 + 454 = 843 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 20 × 85 = 1697 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 763 + 333 = 1091 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 186 + 810 = 996 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 34 × 74 = 2516 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 477 + 758 = 1235 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 69 × 94 = 6486 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 176 + 560 = 730 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 89 × 20 = 1777 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 44 × 68 = 2995 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 30 × 77 = 2310 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 80 × 93 = 7433 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 78 × 43 = 3354 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 695 + 966 = 1661 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 738 + 447 = 1183 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 87 × 37 = 3216 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 434 + 591 = 1016 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 795 + 945 = 1735 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 954 + 698 = 1652 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 853 + 970 = 1823 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 73 × 60 = 4380 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 401 + 611 = 1012 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 31 = 1054 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 862 + 675 = 1537 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 849 + 503 = 1352 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 255 + 665 = 920 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 40 × 73 = 2920 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 14 × 34 = 476 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 98 × 53 = 5194 right or wrong? (a) Right (b) Wrong

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