Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 163 · 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 67 × 61 = 4087 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 38 × 20 = 752 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 581 + 204 = 785 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 83 × 30 = 2490 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 808 + 755 = 1559 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 19 × 93 = 1770 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 894 + 723 = 1611 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 21 × 17 = 357 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 46 × 73 = 3358 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 648 + 765 = 1406 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 311 + 969 = 1280 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 54 × 19 = 1030 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 369 + 117 = 486 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 47 × 72 = 3384 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 99 × 68 = 6732 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 157 + 943 = 1100 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 331 + 247 = 578 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 475 + 646 = 1121 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 419 + 250 = 668 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 745 + 548 = 1293 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 497 + 456 = 953 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 999 + 957 = 1956 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 32 = 416 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 44 × 78 = 3430 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 71 × 25 = 1775 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 682 + 258 = 940 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 32 × 74 = 2368 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 49 × 68 = 3332 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 297 + 343 = 633 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 33 × 72 = 2376 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 82 × 13 = 1066 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 790 + 411 = 1201 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 75 × 30 = 2250 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 24 × 35 = 832 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 315 + 263 = 571 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 458 + 114 = 568 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 74 × 96 = 7104 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 29 × 31 = 890 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 56 × 93 = 5208 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 47 × 64 = 3009 right or wrong? (a) Wrong (b) Right

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