Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 422 · 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 611 + 748 = 1361 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 74 × 59 = 4366 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 40 × 19 = 760 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 410 + 163 = 581 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 26 × 70 = 1818 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 798 + 330 = 1136 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 86 × 30 = 2580 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 25 × 21 = 528 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 959 + 140 = 1099 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 20 × 47 = 940 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 892 + 755 = 1649 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 436 + 300 = 736 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 84 × 46 = 3864 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 46 × 18 = 828 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 77 × 94 = 7238 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 374 + 111 = 482 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 56 × 79 = 4426 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 589 + 901 = 1486 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 61 = 2195 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 19 × 99 = 1877 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 34 × 43 = 1462 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 650 + 878 = 1533 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 358 + 807 = 1165 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 23 × 82 = 1886 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 26 × 36 = 936 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 25 = 832 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 50 × 20 = 1000 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 565 + 388 = 953 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 738 + 872 = 1602 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 32 × 61 = 1952 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 78 × 29 = 2264 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 257 + 836 = 1096 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 682 + 373 = 1061 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 285 + 280 = 565 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 949 + 752 = 1702 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 83 × 52 = 4321 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 29 = 725 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 83 × 20 = 1660 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 44 × 99 = 4349 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 255 + 839 = 1094 right or wrong? (a) Right (b) Wrong

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