Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 672 · 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 395 + 228 = 626 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 58 × 87 = 5043 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 94 × 59 = 5546 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 633 + 634 = 1275 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 47 × 52 = 2443 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 459 + 603 = 1059 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 601 + 682 = 1283 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 116 + 142 = 258 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 939 + 828 = 1775 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 64 × 74 = 4736 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 71 × 98 = 6953 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 66 × 91 = 5999 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 39 × 71 = 2769 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 15 × 26 = 384 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 340 + 699 = 1039 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 349 + 899 = 1257 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 717 + 530 = 1247 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 852 + 910 = 1762 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 278 + 340 = 618 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 67 × 47 = 3149 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 59 = 4130 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 90 × 19 = 1710 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 76 × 46 = 3496 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 37 × 98 = 3626 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 58 × 57 = 3306 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 313 + 880 = 1198 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 46 = 1371 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 326 + 192 = 522 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 52 × 60 = 3124 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 465 + 418 = 883 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 17 × 84 = 1428 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 49 × 97 = 4753 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 44 × 73 = 3212 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 14 = 490 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 17 × 30 = 519 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 947 + 716 = 1661 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 43 × 89 = 3827 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 53 × 32 = 1695 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 546 + 726 = 1267 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 59 = 2655 right or wrong? (a) Right (b) Wrong

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