Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 330 · 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 27 × 65 = 1762 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 22 × 58 = 1281 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 118 + 184 = 302 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 25 × 88 = 2200 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 55 × 19 = 1045 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 346 + 873 = 1219 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 605 + 704 = 1312 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 34 = 476 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 361 + 969 = 1325 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 25 × 43 = 1075 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 79 × 67 = 5301 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 18 × 13 = 234 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 75 = 2328 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 278 + 416 = 694 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 349 + 738 = 1087 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 59 × 80 = 4720 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 674 + 415 = 1089 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 78 × 80 = 6240 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 86 × 57 = 4901 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 827 + 780 = 1607 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 625 + 782 = 1414 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 22 × 73 = 1606 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 24 × 68 = 1632 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 40 × 21 = 842 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 26 × 27 = 702 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 42 × 99 = 4160 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 91 × 12 = 1090 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 883 + 595 = 1476 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 71 × 33 = 2343 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 34 × 43 = 1462 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 263 + 888 = 1156 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 68 × 32 = 2176 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 362 + 352 = 714 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 218 + 637 = 855 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 546 + 732 = 1278 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 432 + 588 = 1020 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 92 = 2844 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 70 × 45 = 3152 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 882 + 241 = 1123 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 95 × 74 = 7030 right or wrong? (a) Right (b) Wrong

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