Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 616 · 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 96 × 99 = 9499 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 34 × 24 = 816 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 14 × 35 = 490 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 345 + 312 = 657 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 26 × 31 = 806 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 50 × 38 = 1892 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 43 × 21 = 906 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 15 × 30 = 450 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 27 × 56 = 1512 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 728 + 980 = 1708 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 555 + 119 = 679 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 409 + 595 = 1005 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 19 × 82 = 1558 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 978 + 754 = 1732 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 18 × 26 = 471 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 28 × 17 = 475 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 425 + 938 = 1363 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 112 + 486 = 598 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 172 + 889 = 1056 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 801 + 611 = 1412 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 984 + 260 = 1242 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 96 × 32 = 3071 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 120 + 179 = 299 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 28 × 45 = 1256 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 55 × 84 = 4620 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 83 × 39 = 3237 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 983 + 305 = 1288 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 99 = 2772 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 691 + 411 = 1102 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 243 + 496 = 743 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 90 × 91 = 8190 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 95 × 45 = 4271 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 67 = 4355 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 19 × 97 = 1844 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 42 × 84 = 3530 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 48 × 25 = 1200 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 92 × 16 = 1472 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 81 × 48 = 3888 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 89 = 7743 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 99 × 34 = 3366 right or wrong? (a) Right (b) Wrong

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