Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 873 · 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 50 × 31 = 1550 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 94 × 53 = 4982 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 19 × 67 = 1274 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 425 + 230 = 655 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 36 × 34 = 1215 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 14 × 76 = 1064 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 926 + 205 = 1132 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 88 × 84 = 7392 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 550 + 285 = 827 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 533 + 301 = 831 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 88 × 75 = 6600 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 28 × 30 = 840 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 69 × 77 = 5306 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 35 × 81 = 2828 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 673 + 690 = 1359 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 64 × 32 = 2045 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 94 × 16 = 1499 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 52 × 50 = 2599 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 27 × 85 = 2295 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 97 = 6393 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 698 + 256 = 960 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 791 + 904 = 1695 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 26 × 18 = 468 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 89 × 15 = 1335 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 988 + 597 = 1585 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 16 × 41 = 656 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 931 + 744 = 1675 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 49 × 49 = 2408 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 67 × 68 = 4558 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 285 + 398 = 683 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 518 + 792 = 1310 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 534 + 501 = 1035 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 43 × 25 = 1072 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 238 + 781 = 1019 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 71 × 61 = 4326 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 419 + 983 = 1394 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 67 × 99 = 6633 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 983 + 839 = 1828 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 47 × 63 = 2961 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 14 × 33 = 462 right or wrong? (a) Right (b) Wrong

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