Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 742 · 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 890 + 424 = 1314 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 40 × 73 = 2921 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 57 × 80 = 4559 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 303 + 250 = 547 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 50 × 66 = 3300 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 105 + 381 = 486 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 51 × 41 = 2091 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 75 × 70 = 5254 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 14 × 75 = 1051 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 300 + 759 = 1052 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 950 + 129 = 1086 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 311 + 401 = 712 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 93 × 13 = 1209 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 264 + 749 = 1011 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 826 + 165 = 991 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 34 × 99 = 3366 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 747 + 182 = 926 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 25 × 31 = 775 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 78 = 1638 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 93 × 59 = 5487 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 55 × 94 = 5170 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 70 × 91 = 6368 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 322 + 990 = 1312 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 68 × 87 = 5916 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 958 + 575 = 1533 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 141 + 315 = 456 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 24 × 51 = 1224 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 112 + 315 = 420 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 331 + 164 = 493 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 541 + 872 = 1413 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 80 × 59 = 4720 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 759 + 720 = 1479 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 81 × 24 = 1944 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 34 × 34 = 1149 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 139 + 442 = 581 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 41 = 2082 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 96 × 79 = 7584 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 421 + 953 = 1374 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 94 × 25 = 2350 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 322 + 592 = 914 right or wrong? (a) Wrong (b) Right

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