Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 772 · 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: 14 × 86 = 1212. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 13 × 52 = 677. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 773 + 447 = 1219. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 222 + 696 = 913. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 32 × 28 = 902. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 61 = 2619. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 60 × 55 = 3294. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 888 + 183 = 1069. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 33 × 20 = 656. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 75 × 29 = 2175. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 595 + 772 = 1372. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 429 + 141 = 572. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 809 + 737 = 1552. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 857 + 440 = 1304. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 749 + 344 = 1093. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 48 × 93 = 4472. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 912 + 877 = 1789. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 541 + 233 = 774. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 91 = 1092. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 94 × 35 = 3284. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 657 + 374 = 1031. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 237 + 999 = 1236. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 343 + 233 = 576. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 231 + 692 = 920. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 782 + 133 = 915. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 92 × 46 = 4227. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 43 × 27 = 1161. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 449 + 623 = 1072. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 122 + 523 = 645. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 771 + 310 = 1081. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 613 + 955 = 1571. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 26 = 1824. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 336 + 650 = 986. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 35 × 15 = 521. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 38 × 61 = 2325. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 518 + 970 = 1481. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 52 × 71 = 3699. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 23 × 58 = 1330. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 18 × 37 = 666. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 48 × 74 = 3552. Correct or wrong? (a) correct (b) wrong

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