Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 281 · 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 25 × 15 = 375 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 26 × 81 = 2106 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 770 + 258 = 1020 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 261 + 717 = 978 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 59 × 23 = 1357 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 331 + 730 = 1061 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 66 = 1254 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 17 = 835 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 874 + 514 = 1391 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 338 + 870 = 1208 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 620 + 391 = 1011 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 34 × 37 = 1258 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 98 × 75 = 7350 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 46 × 66 = 3029 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 492 + 601 = 1092 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 485 + 148 = 633 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 182 + 163 = 351 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 904 + 952 = 1856 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 733 + 544 = 1286 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 943 + 579 = 1525 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 91 × 25 = 2273 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 94 × 47 = 4418 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 687 + 682 = 1369 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 901 + 581 = 1483 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 48 × 40 = 1920 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 54 × 43 = 2326 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 44 × 26 = 1144 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 61 = 3727 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 669 + 224 = 893 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 715 + 558 = 1273 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 548 + 878 = 1426 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 69 × 48 = 3312 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 460 + 785 = 1245 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 143 + 513 = 663 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 211 + 701 = 915 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 216 + 706 = 922 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 20 × 20 = 400 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 25 = 575 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 20 × 14 = 283 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 805 + 501 = 1315 right or wrong? (a) Right (b) Wrong

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