Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 579 · 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 628 + 363 = 991 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 341 + 645 = 987 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 994 + 246 = 1237 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 231 + 445 = 679 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 849 + 139 = 988 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 945 + 252 = 1196 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 24 × 24 = 576 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 66 = 3300 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 574 + 325 = 904 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 73 × 13 = 949 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 235 + 767 = 1007 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 196 + 434 = 633 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 227 + 949 = 1168 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 287 + 337 = 627 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 59 × 58 = 3420 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 248 + 627 = 882 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 913 + 142 = 1063 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 228 + 671 = 899 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 30 = 1440 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 107 + 725 = 832 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 74 × 95 = 7030 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 12 × 32 = 376 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 38 × 31 = 1178 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 232 + 198 = 430 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 899 + 128 = 1030 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 62 × 54 = 3348 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 89 × 22 = 1958 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 327 + 409 = 736 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 743 + 848 = 1593 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 245 + 369 = 614 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 567 + 336 = 895 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 315 + 561 = 885 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 98 × 71 = 6955 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 13 × 60 = 780 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 87 = 5212 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 723 + 640 = 1356 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 318 + 327 = 645 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 671 + 407 = 1078 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 697 + 141 = 838 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 32 × 66 = 2112 right or wrong? (a) Right (b) Wrong

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