Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 55 · 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 85 × 85 = 7225 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 39 × 61 = 2379 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 59 = 3953 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 925 + 662 = 1592 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 21 × 89 = 1869 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 22 × 12 = 264 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 22 × 55 = 1210 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 88 = 2200 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 34 × 88 = 2991 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 575 + 315 = 893 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 53 × 34 = 1802 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 97 × 69 = 6700 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 770 + 266 = 1036 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 93 × 24 = 2232 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 493 + 303 = 788 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 47 × 71 = 3337 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 95 × 75 = 7125 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 114 + 950 = 1064 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 28 × 94 = 2637 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 585 + 896 = 1472 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 58 × 25 = 1453 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 58 × 81 = 4699 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 19 × 88 = 1672 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 212 + 619 = 831 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 19 × 36 = 681 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 26 × 53 = 1378 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 23 = 430 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 22 × 28 = 616 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 97 × 62 = 6014 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 22 × 57 = 1254 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 599 + 132 = 731 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 115 + 371 = 486 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 58 × 20 = 1160 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 975 + 694 = 1673 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 14 = 672 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 249 + 614 = 863 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 408 + 674 = 1082 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 87 × 99 = 8609 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 537 + 318 = 855 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 28 = 2296 right or wrong? (a) Wrong (b) Right

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