Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 827 · 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 15 × 18 = 270 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 92 × 82 = 7551 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 76 × 82 = 6232 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 92 = 8932 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 29 = 2376 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 97 × 24 = 2325 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 305 + 268 = 575 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 35 × 74 = 2581 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 82 × 17 = 1390 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 36 × 25 = 893 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 14 × 26 = 356 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 27 × 88 = 2384 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 74 × 30 = 2223 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 326 + 929 = 1248 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 14 = 837 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 387 + 780 = 1167 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 374 + 202 = 576 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 54 × 94 = 5076 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 26 × 98 = 2548 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 172 + 219 = 391 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 575 + 497 = 1075 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 96 × 93 = 8928 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 67 = 3879 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 201 + 117 = 318 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 74 × 93 = 6890 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 977 + 799 = 1774 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 343 + 835 = 1178 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 703 + 463 = 1170 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 548 + 790 = 1331 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 888 + 528 = 1416 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 84 × 27 = 2268 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 17 × 79 = 1343 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 64 × 61 = 3905 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 931 + 245 = 1173 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 78 × 98 = 7644 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 44 × 88 = 3872 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 83 × 28 = 2324 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 92 × 68 = 6256 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 739 + 259 = 998 right or wrong? (a) Wrong (b) Right

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