Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 214 · 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 336 + 470 = 806 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 453 + 669 = 1122 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 370 + 160 = 530 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 113 + 493 = 606 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 684 + 741 = 1428 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 351 + 638 = 989 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 686 + 132 = 818 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 60 × 91 = 5463 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 940 + 777 = 1722 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 186 + 856 = 1042 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 90 × 97 = 8730 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 320 + 657 = 977 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 82 × 51 = 4180 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 21 × 24 = 504 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 700 + 902 = 1609 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 19 × 76 = 1444 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 56 × 49 = 2744 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 94 × 18 = 1694 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 516 + 251 = 767 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 257 + 559 = 816 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 473 + 185 = 652 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 82 × 20 = 1644 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 51 × 28 = 1428 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 216 + 829 = 1039 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 87 × 85 = 7395 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 60 × 84 = 5040 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 144 + 672 = 816 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 277 + 867 = 1144 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 947 + 155 = 1102 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 124 + 151 = 275 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 206 + 601 = 799 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 60 × 14 = 840 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 22 × 20 = 443 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 32 × 24 = 773 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 771 + 383 = 1154 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 571 + 113 = 684 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 530 + 965 = 1495 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 19 × 57 = 1083 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 576 + 302 = 869 right or wrong? (a) Wrong (b) Right

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