Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 339 · 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 23 × 83 = 1909 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 49 × 55 = 2693 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 47 × 17 = 792 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 51 × 77 = 3928 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 23 × 79 = 1817 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 38 = 1253 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 82 × 94 = 7708 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 39 × 38 = 1487 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 333 + 661 = 987 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 33 × 82 = 2697 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 513 + 387 = 900 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 37 × 41 = 1517 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 270 + 438 = 710 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 633 + 248 = 884 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 58 = 986 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 83 × 65 = 5395 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 58 = 1160 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 475 + 462 = 937 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 86 × 14 = 1209 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 99 × 18 = 1781 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 53 × 35 = 1852 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 160 + 417 = 577 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 127 + 751 = 882 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 335 + 622 = 957 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 661 + 623 = 1283 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 42 × 85 = 3570 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 173 + 353 = 517 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 980 + 530 = 1510 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 981 + 485 = 1466 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 207 + 990 = 1197 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 50 × 70 = 3505 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 92 × 88 = 8096 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 49 × 86 = 4214 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 821 + 989 = 1810 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 784 + 782 = 1566 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 89 × 38 = 3382 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 631 + 211 = 841 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 80 × 73 = 5849 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 109 + 855 = 964 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 86 × 66 = 5672 right or wrong? (a) Wrong (b) Right

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