Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 568 · 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 76 × 73 = 5548 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 33 × 21 = 695 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 232 + 558 = 781 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 62 × 69 = 4278 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 860 + 594 = 1461 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 38 × 81 = 3078 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 42 × 41 = 1713 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 14 = 182 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 407 + 728 = 1129 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 48 = 576 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 65 × 49 = 3190 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 46 × 70 = 3220 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 273 + 920 = 1195 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 723 + 755 = 1476 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 680 + 756 = 1428 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 16 × 19 = 300 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 94 × 69 = 6485 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 338 + 688 = 1021 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 47 × 14 = 658 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 68 × 26 = 1768 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 91 × 20 = 1820 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 42 × 24 = 1001 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 407 + 652 = 1058 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 755 + 253 = 1001 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 596 + 795 = 1386 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 13 × 28 = 364 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 258 + 977 = 1244 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 505 + 240 = 743 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 33 × 31 = 1029 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 258 + 455 = 719 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 37 × 48 = 1776 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 589 + 416 = 1006 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 22 × 55 = 1202 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 97 = 8536 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 260 + 770 = 1030 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 59 = 3481 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 50 × 79 = 3946 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 953 + 147 = 1100 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 654 + 422 = 1076 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 26 = 1981 right or wrong? (a) Wrong (b) Right

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