Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 617 · 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 239 + 363 = 600 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 45 = 1251 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 34 × 22 = 749 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 61 × 51 = 3111 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 581 + 686 = 1259 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 60 × 81 = 4869 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 350 + 694 = 1044 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 358 + 508 = 866 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 75 × 62 = 4650 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 39 × 75 = 2925 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 283 + 807 = 1090 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 72 × 98 = 7056 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 808 + 145 = 953 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 86 = 2236 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 140 + 262 = 404 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 663 + 159 = 831 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 64 × 93 = 5952 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 99 × 58 = 5742 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 85 × 16 = 1360 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 13 × 15 = 204 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 906 + 263 = 1169 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 676 + 938 = 1614 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 263 + 804 = 1067 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 601 + 920 = 1521 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 16 × 43 = 684 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 85 × 18 = 1530 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 74 × 38 = 2818 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 29 × 94 = 2725 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 926 + 659 = 1585 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 69 × 52 = 3597 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 15 × 29 = 428 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 66 = 1839 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 28 × 53 = 1484 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 95 × 49 = 4655 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 57 × 59 = 3363 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 93 × 98 = 9114 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 58 × 97 = 5626 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 62 × 38 = 2356 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 86 = 8425 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 22 × 36 = 798 right or wrong? (a) Wrong (b) Right

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