Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 881 · 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: 688 + 959 = 1647. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 97 = 6307. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 96 = 3556. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 51 × 60 = 3066. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 96 × 71 = 6813. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 33 × 77 = 2538. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 546 + 189 = 733. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 96 × 27 = 2592. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 503 + 726 = 1228. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 719 + 278 = 991. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 260 + 841 = 1095. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 84 × 20 = 1682. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 968 + 957 = 1917. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 66 × 85 = 5608. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 218 + 920 = 1139. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 736 + 748 = 1484. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 32 × 61 = 1952. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 794 + 258 = 1052. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 84 × 99 = 8321. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 784 + 750 = 1534. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 275 + 221 = 490. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 40 × 31 = 1240. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 984 + 273 = 1257. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 899 + 971 = 1870. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 162 + 774 = 936. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 686 + 873 = 1553. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 23 × 15 = 345. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 885 + 277 = 1162. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 693 + 843 = 1538. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 973 + 379 = 1360. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 17 × 94 = 1598. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 42 = 3198. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 682 + 503 = 1185. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 89 = 7387. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 93 × 18 = 1674. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 74 × 72 = 5328. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 75 × 36 = 2699. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 62 × 47 = 2911. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 37 × 57 = 2103. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 13 × 17 = 223. Correct or wrong? (a) wrong (b) correct

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