Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 348 · 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 91 × 35 = 3184 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 255 + 837 = 1092 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 627 + 302 = 929 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 182 + 179 = 361 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 52 × 48 = 2498 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 212 + 117 = 338 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 56 × 31 = 1735 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 153 + 611 = 755 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 84 = 1756 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 72 × 71 = 5112 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 64 × 87 = 5568 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 24 × 28 = 678 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 37 × 23 = 855 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 556 + 887 = 1441 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 84 × 93 = 7810 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 64 × 82 = 5248 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 73 × 67 = 4888 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 335 + 578 = 922 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 951 + 864 = 1815 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 24 × 49 = 1178 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 520 + 831 = 1351 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 85 × 57 = 4845 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 789 + 807 = 1602 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 154 + 995 = 1150 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 341 + 436 = 777 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 902 + 444 = 1346 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 686 + 264 = 950 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 394 + 318 = 712 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 61 × 64 = 3913 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 717 + 925 = 1647 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 26 × 42 = 1092 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 474 + 161 = 635 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 611 + 838 = 1449 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 768 + 307 = 1071 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 258 + 995 = 1253 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 60 × 44 = 2640 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 66 = 3498 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 62 × 90 = 5578 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 583 + 318 = 901 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 14 = 1027 right or wrong? (a) Right (b) Wrong

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