Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 202 · 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 408 + 122 = 530 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 55 × 61 = 3355 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 24 × 27 = 648 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 37 × 57 = 2109 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 934 + 576 = 1511 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 957 + 950 = 1907 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 16 × 33 = 528 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 29 × 27 = 775 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 225 + 752 = 980 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 48 × 64 = 3070 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 910 + 266 = 1176 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 164 + 708 = 875 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 97 = 9019 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 56 × 62 = 3472 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 348 + 344 = 692 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 86 × 88 = 7568 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 352 + 784 = 1141 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 27 = 1053 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 728 + 446 = 1174 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 56 × 37 = 2072 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 55 × 29 = 1595 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 716 + 352 = 1059 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 12 = 436 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 89 × 73 = 6504 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 222 + 389 = 611 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 96 × 66 = 6336 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 23 × 28 = 650 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 364 + 806 = 1170 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 53 × 85 = 4499 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 34 × 38 = 1289 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 86 × 43 = 3698 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 336 + 250 = 584 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 92 × 53 = 4876 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 29 × 20 = 580 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 216 + 593 = 804 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 581 + 532 = 1104 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 829 + 172 = 994 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 436 + 807 = 1243 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 294 + 968 = 1262 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 286 + 486 = 772 right or wrong? (a) Wrong (b) Right

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