Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 404 · 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 517 + 670 = 1187 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 12 = 456 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 337 + 599 = 936 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 262 + 556 = 818 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 76 × 77 = 5852 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 510 + 806 = 1308 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 81 × 85 = 6882 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 91 × 18 = 1638 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 88 × 36 = 3172 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 64 × 46 = 2940 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 230 + 775 = 1005 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 76 × 91 = 6913 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 40 × 70 = 2800 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 497 + 254 = 751 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 743 + 742 = 1485 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 606 + 894 = 1500 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 599 + 647 = 1246 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 597 + 980 = 1577 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 517 + 962 = 1479 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 279 + 505 = 784 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 411 + 716 = 1136 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 20 × 55 = 1100 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 334 + 419 = 746 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 255 + 899 = 1158 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 45 × 31 = 1396 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 752 + 355 = 1107 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 93 × 94 = 8742 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 444 + 942 = 1379 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 92 × 29 = 2668 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 16 × 27 = 432 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 182 + 415 = 600 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 213 + 108 = 316 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 552 + 761 = 1310 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 68 × 88 = 5976 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 825 + 489 = 1316 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 49 = 1225 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 88 × 81 = 7120 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 687 + 864 = 1551 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 29 × 22 = 638 right or wrong? (a) Wrong (b) Right

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