Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 387 · 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 368 + 182 = 555 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 605 + 867 = 1467 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 250 + 634 = 881 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 852 + 614 = 1466 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 440 + 326 = 766 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 76 × 89 = 6758 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 48 × 26 = 1248 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 86 × 94 = 8084 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 621 + 644 = 1265 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 276 + 542 = 818 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 642 + 744 = 1391 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 791 + 850 = 1646 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 944 + 553 = 1502 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 709 + 839 = 1548 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 143 + 798 = 941 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 17 × 95 = 1616 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 45 × 59 = 2655 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 775 + 422 = 1200 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 213 + 303 = 515 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 604 + 388 = 989 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 661 + 961 = 1615 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 343 + 723 = 1067 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 869 + 540 = 1409 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 805 + 554 = 1359 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 948 + 421 = 1369 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 83 × 48 = 3987 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 38 × 47 = 1789 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 593 + 485 = 1077 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 35 × 61 = 2141 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 810 + 515 = 1325 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 65 × 69 = 4485 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 39 × 51 = 1989 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 40 × 70 = 2801 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 80 × 62 = 4968 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 372 + 848 = 1215 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 96 × 89 = 8544 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 40 × 79 = 3160 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 336 + 348 = 685 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 42 × 24 = 1008 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 655 + 433 = 1091 right or wrong? (a) Right (b) Wrong

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