Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 797 · 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 772 + 773 = 1545 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 336 + 935 = 1270 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 33 × 75 = 2475 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 198 + 405 = 603 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 873 + 959 = 1832 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 437 + 641 = 1082 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 433 + 234 = 667 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 265 + 335 = 606 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 269 + 319 = 588 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 347 + 640 = 987 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 531 + 905 = 1431 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 75 = 7125 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 479 + 225 = 701 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 66 × 41 = 2708 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 381 + 398 = 775 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 61 × 66 = 4029 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 677 + 822 = 1504 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 118 + 908 = 1026 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 388 + 230 = 618 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 91 × 24 = 2184 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 28 × 31 = 865 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 15 = 255 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 25 × 68 = 1698 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 129 + 767 = 889 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 838 + 328 = 1170 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 575 + 608 = 1183 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 92 × 43 = 3956 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 86 × 77 = 6622 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 86 × 80 = 6887 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 504 + 150 = 662 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 684 + 526 = 1210 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 317 + 204 = 521 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 23 × 44 = 1012 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 431 + 156 = 578 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 776 + 181 = 957 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 29 × 38 = 1102 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 694 + 801 = 1496 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 95 × 96 = 9120 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 41 × 46 = 1886 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 314 + 989 = 1296 right or wrong? (a) Wrong (b) Right

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