Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 658 · 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 789 + 957 = 1746 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 67 × 60 = 4020 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 45 × 62 = 2790 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 593 + 208 = 801 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 30 × 80 = 2400 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 987 + 788 = 1773 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 692 + 663 = 1355 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 650 + 259 = 901 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 135 + 782 = 917 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 78 × 17 = 1326 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 492 + 735 = 1227 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 51 × 41 = 2097 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 768 + 425 = 1193 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 873 + 398 = 1269 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 186 + 598 = 784 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 98 × 38 = 3724 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 945 + 256 = 1201 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 300 + 707 = 1011 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 314 + 409 = 726 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 443 + 697 = 1139 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 445 + 360 = 805 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 729 + 291 = 1020 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 187 + 925 = 1112 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 48 × 31 = 1491 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 76 × 13 = 987 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 882 + 365 = 1251 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 18 × 72 = 1289 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 986 + 366 = 1352 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 68 × 20 = 1360 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 35 × 57 = 1995 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 291 + 704 = 995 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 33 × 12 = 396 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 16 × 36 = 576 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 64 × 88 = 5634 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 72 × 37 = 2664 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 72 = 3669 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 699 + 368 = 1065 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 583 + 122 = 698 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 56 × 96 = 5376 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 88 × 64 = 5625 right or wrong? (a) Wrong (b) Right

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