Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 882 · 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 29 × 26 = 749 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 289 + 515 = 796 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 86 × 33 = 2845 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 988 + 384 = 1365 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 24 × 84 = 2016 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 809 + 214 = 1023 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 25 = 500 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 58 × 53 = 3079 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 67 × 91 = 6097 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 36 × 52 = 1874 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 543 + 216 = 759 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 95 × 83 = 7885 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 754 + 827 = 1581 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 13 × 13 = 169 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 85 × 41 = 3481 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 48 × 31 = 1496 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 259 + 222 = 489 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 202 + 437 = 639 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 92 × 12 = 1102 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 96 = 6432 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 610 + 221 = 831 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 632 + 991 = 1628 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 312 + 926 = 1239 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 690 + 893 = 1578 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 927 + 894 = 1830 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 552 + 345 = 898 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 319 + 634 = 953 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 818 + 949 = 1776 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 32 × 20 = 639 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 930 + 405 = 1328 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 34 × 39 = 1320 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 856 + 589 = 1445 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 360 + 555 = 915 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 866 + 687 = 1553 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 177 + 395 = 572 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 75 × 92 = 6900 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 96 × 45 = 4320 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 26 = 728 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 781 + 152 = 933 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 43 × 30 = 1285 right or wrong? (a) Right (b) Wrong

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