Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 563 · 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 485 + 181 = 664 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 351 + 326 = 669 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 75 × 41 = 3075 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 248 + 649 = 899 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 83 × 99 = 8217 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 877 + 871 = 1751 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 30 × 97 = 2910 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 249 + 905 = 1154 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 94 × 92 = 8648 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 74 × 61 = 4514 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 471 + 681 = 1152 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 94 × 53 = 4977 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 42 × 72 = 3024 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 21 = 483 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 75 = 1277 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 709 + 154 = 863 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 35 = 451 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 417 + 346 = 755 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 36 × 70 = 2515 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 25 × 53 = 1325 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 83 × 76 = 6301 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 73 × 80 = 5833 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 83 = 3071 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 683 + 262 = 947 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 977 + 269 = 1246 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 97 × 27 = 2619 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 19 = 1355 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 68 = 1899 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 470 + 913 = 1375 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 369 + 211 = 580 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 94 × 54 = 5076 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 979 + 175 = 1154 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 48 = 1248 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 30 × 63 = 1890 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 598 + 853 = 1451 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 596 + 567 = 1159 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 64 = 3392 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 28 = 784 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 69 × 17 = 1167 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 33 = 627 right or wrong? (a) Wrong (b) Right

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