Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 413 · 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 981 + 525 = 1515 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 75 × 78 = 5856 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 19 × 72 = 1361 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 18 × 43 = 771 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 50 × 70 = 3500 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 642 + 313 = 955 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 23 × 33 = 759 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 455 + 493 = 957 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 76 × 85 = 6460 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 598 + 698 = 1296 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 97 × 97 = 9408 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 139 + 839 = 978 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 772 + 767 = 1536 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 871 + 272 = 1141 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 69 × 13 = 897 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 87 × 99 = 8608 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 581 + 962 = 1543 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 507 + 631 = 1137 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 683 + 140 = 823 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 19 = 857 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 75 × 25 = 1875 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 220 + 671 = 891 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 278 + 303 = 587 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 743 + 302 = 1054 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 947 + 495 = 1442 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 451 + 260 = 710 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 145 + 499 = 644 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 56 × 15 = 834 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 781 + 512 = 1291 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 82 × 58 = 4756 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 357 + 255 = 612 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 361 + 480 = 841 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 54 × 50 = 2700 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 219 + 388 = 607 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 575 + 684 = 1256 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 17 × 12 = 205 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 87 = 4863 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 65 × 47 = 3055 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 393 + 196 = 589 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 79 × 19 = 1500 right or wrong? (a) Wrong (b) Right

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