Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 500 · 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 125 + 218 = 343 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 97 × 48 = 4665 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 745 + 290 = 1032 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 657 + 537 = 1194 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 741 + 870 = 1611 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 48 × 35 = 1680 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 13 = 1222 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 88 × 89 = 7840 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 878 + 731 = 1609 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 826 + 472 = 1295 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 96 = 9318 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 61 = 4148 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 42 × 78 = 3272 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 64 × 79 = 5061 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 73 × 13 = 949 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 84 × 20 = 1680 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 24 × 68 = 1632 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 92 × 65 = 5973 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 985 + 806 = 1791 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 87 × 80 = 6960 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 822 + 526 = 1344 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 33 × 36 = 1188 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 26 × 35 = 910 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 396 + 512 = 908 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 614 + 284 = 898 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 48 × 93 = 4464 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 233 + 431 = 664 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 787 + 251 = 1036 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 50 × 50 = 2500 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 178 + 248 = 435 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 90 × 47 = 4233 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 13 × 43 = 551 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 463 + 211 = 680 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 256 + 475 = 728 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 131 + 170 = 301 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 496 + 542 = 1033 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 454 + 901 = 1355 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 21 × 20 = 426 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 149 + 577 = 726 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 716 + 107 = 823 right or wrong? (a) Right (b) Wrong

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