Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 430 · 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 36 × 29 = 1043 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 78 × 24 = 1877 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 414 + 388 = 802 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 35 = 1294 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 228 + 606 = 834 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 55 × 18 = 982 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 16 × 66 = 1052 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 360 + 194 = 554 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 498 + 864 = 1362 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 204 + 197 = 401 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 15 × 13 = 195 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 23 × 69 = 1596 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 48 × 17 = 816 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 918 + 381 = 1299 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 37 × 72 = 2668 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 907 + 507 = 1414 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 972 + 823 = 1795 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 356 + 694 = 1050 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 768 + 709 = 1470 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 829 + 187 = 1016 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 204 + 908 = 1112 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 83 × 64 = 5303 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 23 × 24 = 552 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 95 × 87 = 8265 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 54 × 85 = 4590 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 56 × 82 = 4592 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 99 = 3467 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 43 × 25 = 1075 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 68 × 62 = 4217 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 52 × 41 = 2129 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 110 + 821 = 931 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 177 + 316 = 500 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 561 + 384 = 945 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 899 + 671 = 1562 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 63 × 79 = 4977 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 253 + 784 = 1037 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 784 + 409 = 1186 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 31 × 81 = 2510 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 52 × 45 = 2340 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 98 × 77 = 7546 right or wrong? (a) Wrong (b) Right

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