Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 638 · 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 33 × 38 = 1254 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 59 × 23 = 1357 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 528 + 717 = 1249 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 379 + 287 = 668 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 193 + 145 = 341 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 413 + 833 = 1242 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 745 + 610 = 1355 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 22 = 968 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 59 = 1240 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 30 = 1684 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 18 × 36 = 648 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 47 × 86 = 4033 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 751 + 701 = 1454 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 765 + 332 = 1090 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 43 × 20 = 860 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 74 × 65 = 4810 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 341 + 533 = 883 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 22 × 80 = 1760 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 93 × 54 = 5020 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 249 + 438 = 687 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 72 × 88 = 6335 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 474 + 338 = 812 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 897 + 156 = 1059 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 42 × 18 = 756 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 265 + 434 = 699 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 79 = 4108 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 413 + 867 = 1280 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 62 × 33 = 2047 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 88 × 62 = 5456 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 166 + 541 = 707 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 48 × 58 = 2783 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 487 + 460 = 955 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 904 + 713 = 1622 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 83 × 62 = 5146 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 912 + 171 = 1085 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 583 + 409 = 992 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 89 × 53 = 4717 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 16 × 87 = 1392 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 38 × 30 = 1138 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 397 + 732 = 1129 right or wrong? (a) Wrong (b) Right

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