Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 237 · 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: 136 + 829 = 971. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 401 + 255 = 654. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 52 × 85 = 4420. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 28 × 28 = 781. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 201 + 912 = 1119. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 604 + 800 = 1404. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 761 + 911 = 1679. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 122 + 821 = 943. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 740 + 758 = 1498. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 376 + 411 = 792. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 86 × 80 = 6880. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 187 + 845 = 1031. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 27 × 17 = 451. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 61 × 78 = 4753. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 82 = 7048. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 929 + 328 = 1257. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 93 = 1674. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 48 × 92 = 4416. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 511 + 790 = 1301. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 262 + 393 = 652. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 43 × 55 = 2369. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 85 × 25 = 2125. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 39 × 93 = 3627. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 58 × 33 = 1918. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 770 + 826 = 1596. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 26 × 33 = 859. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 85 × 43 = 3659. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 71 = 2556. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 67 × 28 = 1879. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 331 + 133 = 464. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 470 + 660 = 1130. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 17 × 96 = 1640. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 38 × 25 = 950. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 893 + 732 = 1625. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 78 × 87 = 6792. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 92 × 93 = 8555. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 740 + 797 = 1537. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 360 + 834 = 1194. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 334 + 220 = 554. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 219 + 240 = 463. Correct or wrong? (a) wrong (b) correct

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