Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 114 · 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 771 + 463 = 1231 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 92 × 41 = 3772 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 71 × 52 = 3684 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 154 + 115 = 269 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 606 + 818 = 1426 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 829 + 587 = 1423 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 13 = 286 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 59 = 2127 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 611 + 915 = 1526 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 106 + 746 = 845 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 12 × 97 = 1157 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 57 × 79 = 4499 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 46 × 94 = 4324 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 30 × 95 = 2851 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 346 + 452 = 798 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 114 + 673 = 787 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 38 × 42 = 1597 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 15 × 59 = 885 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 75 × 85 = 6375 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 93 × 33 = 3069 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 790 + 848 = 1638 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 984 + 538 = 1515 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 44 = 1408 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 45 × 17 = 765 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 37 × 65 = 2406 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 553 + 734 = 1287 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 916 + 688 = 1605 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 86 × 69 = 5934 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 266 + 253 = 518 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 30 × 40 = 1199 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 15 × 38 = 567 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 75 × 39 = 2929 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 45 = 4184 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 35 × 45 = 1583 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 38 × 42 = 1587 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 757 + 827 = 1584 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 312 + 852 = 1169 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 21 × 19 = 390 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 804 + 129 = 930 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 683 + 125 = 808 right or wrong? (a) Wrong (b) Right

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