Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 825 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 70 × 30 = 2100. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 72 × 52 = 3744. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 998 + 640 = 1638. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 837 + 159 = 996. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 75 × 95 = 7117. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 47 × 34 = 1598. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 990 + 355 = 1347. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 896 + 884 = 1785. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 553 + 397 = 950. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 218 + 841 = 1053. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 210 + 579 = 789. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 340 + 987 = 1333. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 535 + 213 = 749. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 33 × 34 = 1122. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 912 + 233 = 1145. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 288 + 197 = 485. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 631 + 130 = 761. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 29 × 48 = 1400. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 676 + 911 = 1587. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 22 = 2160. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 75 × 71 = 5320. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 706 + 209 = 915. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 77 × 39 = 3003. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 52 × 23 = 1197. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 130 + 769 = 899. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 50 × 66 = 3300. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 707 + 843 = 1550. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 792 + 618 = 1410. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 31 × 51 = 1581. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 282 + 212 = 497. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 60 × 17 = 1020. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 40 × 23 = 913. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 326 + 804 = 1130. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 35 × 16 = 560. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 65 × 22 = 1430. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 728 + 967 = 1695. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 26 × 26 = 683. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 987 + 779 = 1764. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 79 × 40 = 3161. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 89 × 71 = 6323. Correct or wrong? (a) correct (b) wrong

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