Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 305 · 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 65 × 21 = 1365 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 61 × 26 = 1583 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 191 + 606 = 788 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 22 = 1950 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 94 × 18 = 1692 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 73 = 4526 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 37 × 51 = 1887 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 442 + 411 = 853 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 28 × 21 = 591 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 381 + 212 = 585 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 91 × 72 = 6547 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 53 × 28 = 1484 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 375 + 938 = 1306 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 95 = 2755 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 591 + 855 = 1440 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 649 + 944 = 1593 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 70 = 3355 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 244 + 596 = 840 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 57 × 76 = 4330 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 35 × 53 = 1852 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 71 × 31 = 2200 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 61 × 87 = 5307 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 237 + 268 = 505 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 705 + 456 = 1156 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 62 × 62 = 3841 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 25 × 30 = 747 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 784 + 496 = 1280 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 700 + 661 = 1361 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 967 + 127 = 1094 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 949 + 387 = 1333 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 57 × 57 = 3246 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 151 + 866 = 1023 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 28 × 18 = 498 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 892 + 144 = 1036 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 521 + 162 = 675 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 433 + 882 = 1315 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 91 × 95 = 8645 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 390 + 751 = 1141 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 81 × 85 = 6889 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 39 × 80 = 3120 right or wrong? (a) Wrong (b) Right

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