Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 722 · 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 78 × 87 = 6786 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 70 × 53 = 3707 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 321 + 426 = 739 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 242 + 602 = 844 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 854 + 111 = 965 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 993 + 656 = 1649 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 17 = 1598 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 276 + 803 = 1071 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 98 × 40 = 3914 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 57 × 49 = 2790 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 826 + 574 = 1393 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 74 × 53 = 3927 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 265 + 190 = 455 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 73 × 85 = 6205 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 577 + 565 = 1142 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 554 + 968 = 1531 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 96 × 38 = 3647 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 716 + 445 = 1170 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 831 + 892 = 1723 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 41 × 91 = 3727 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 80 = 5600 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 45 × 87 = 3915 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 91 = 8281 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 67 = 1608 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 643 + 184 = 833 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 650 + 128 = 778 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 929 + 227 = 1156 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 599 + 544 = 1143 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 23 × 47 = 1072 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 590 + 744 = 1334 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 14 × 80 = 1120 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 90 × 64 = 5760 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 107 + 976 = 1083 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 272 + 223 = 495 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 71 × 47 = 3338 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 52 × 25 = 1296 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 82 × 98 = 8045 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 94 × 82 = 7708 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 423 + 111 = 536 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 384 + 551 = 943 right or wrong? (a) Wrong (b) Right

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