Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 768 · 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 37 × 20 = 739 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 422 + 381 = 803 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 61 × 76 = 4636 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 380 + 215 = 595 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 33 × 72 = 2378 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 996 + 451 = 1447 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 92 = 1753 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 81 × 15 = 1215 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 804 + 828 = 1638 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 42 = 3906 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 755 + 105 = 860 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 40 × 70 = 2800 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 31 = 1951 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 33 × 99 = 3268 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 68 × 87 = 5916 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 481 + 157 = 638 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 97 = 3486 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 669 + 536 = 1205 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 72 × 43 = 3096 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 894 + 972 = 1866 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 36 × 49 = 1764 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 33 × 61 = 2013 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 67 × 74 = 4958 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 686 + 209 = 895 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 551 + 504 = 1051 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 180 + 250 = 438 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 991 + 796 = 1784 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 69 × 65 = 4485 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 474 + 401 = 875 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 499 + 437 = 938 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 268 + 461 = 729 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 99 × 79 = 7825 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 631 + 954 = 1585 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 21 × 13 = 273 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 247 + 967 = 1221 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 65 = 1816 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 497 + 377 = 874 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 854 + 311 = 1165 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 73 × 22 = 1606 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 228 + 360 = 583 right or wrong? (a) Wrong (b) Right

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