Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 540 · 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 267 + 147 = 414 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 195 + 393 = 588 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 621 + 596 = 1216 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 204 + 982 = 1184 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 42 × 89 = 3733 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 25 × 26 = 650 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 43 × 76 = 3268 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 589 + 404 = 995 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 12 × 71 = 852 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 303 + 761 = 1064 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 420 + 894 = 1314 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 539 + 431 = 970 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 42 × 72 = 3016 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 510 + 406 = 916 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 509 + 277 = 789 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 77 × 24 = 1853 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 319 + 124 = 443 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 38 × 89 = 3379 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 356 + 935 = 1294 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 86 × 18 = 1548 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 930 + 511 = 1446 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 33 × 27 = 891 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 351 + 727 = 1078 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 772 + 217 = 996 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 58 × 22 = 1276 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 869 + 969 = 1840 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 684 + 945 = 1629 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 126 + 213 = 339 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 82 × 40 = 3274 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 64 × 92 = 5888 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 779 + 378 = 1148 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 89 × 33 = 2937 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 52 × 14 = 728 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 948 + 425 = 1364 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 244 + 604 = 854 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 345 + 311 = 648 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 57 × 67 = 3819 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 91 × 53 = 4832 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 72 × 81 = 5823 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 59 × 73 = 4307 right or wrong? (a) Right (b) Wrong

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