Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 173 · 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 97 × 71 = 6883 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 313 + 383 = 687 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 24 × 60 = 1440 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 53 × 78 = 4134 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 25 × 88 = 2200 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 30 × 74 = 2214 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 507 + 560 = 1067 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 63 = 3717 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 59 × 92 = 5428 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 23 × 16 = 364 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 15 × 17 = 255 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 960 + 131 = 1087 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 306 + 110 = 416 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 762 + 979 = 1741 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 417 + 628 = 1045 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 989 + 890 = 1881 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 656 + 729 = 1385 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 872 + 197 = 1069 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 78 = 3428 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 522 + 830 = 1355 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 369 + 567 = 936 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 183 + 180 = 363 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 493 + 230 = 723 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 777 + 554 = 1340 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 761 + 490 = 1252 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 627 + 352 = 979 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 536 + 851 = 1379 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 518 + 652 = 1170 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 139 + 841 = 983 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 29 × 13 = 377 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 69 × 84 = 5796 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 168 + 383 = 551 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 769 + 575 = 1344 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 24 × 26 = 628 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 786 + 840 = 1626 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 15 × 62 = 938 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 992 + 538 = 1529 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 14 = 784 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 27 × 54 = 1458 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 39 × 75 = 2925 right or wrong? (a) Right (b) Wrong

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