Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 575 · 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 31 × 73 = 2263 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 608 + 998 = 1606 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 29 × 40 = 1160 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 800 + 939 = 1739 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 394 + 634 = 1034 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 924 + 268 = 1192 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 295 + 384 = 679 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 225 + 547 = 775 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 42 × 26 = 1091 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 63 × 23 = 1449 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 852 + 176 = 1028 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 268 + 339 = 606 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 116 + 771 = 887 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 28 × 14 = 392 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 76 = 912 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 54 × 67 = 3612 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 915 + 639 = 1545 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 88 × 66 = 5808 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 687 + 204 = 890 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 88 × 98 = 8624 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 698 + 988 = 1686 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 267 + 566 = 831 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 828 + 405 = 1233 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 92 × 27 = 2484 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 50 × 30 = 1492 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 91 × 34 = 3097 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 95 × 32 = 3040 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 21 × 24 = 504 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 27 × 41 = 1107 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 349 + 260 = 609 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 46 × 92 = 4232 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 59 × 30 = 1770 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 191 + 205 = 400 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 32 × 81 = 2592 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 17 × 32 = 544 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 87 × 69 = 6003 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 384 + 137 = 521 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 84 × 72 = 6046 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 32 × 28 = 896 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 891 + 163 = 1054 right or wrong? (a) Right (b) Wrong

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