Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 979 · 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: 92 × 39 = 3587. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 64 × 46 = 2939. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 72 × 53 = 3813. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 15 × 15 = 225. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 860 + 635 = 1495. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 961 + 767 = 1727. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 22 × 74 = 1628. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 383 + 256 = 647. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 75 × 37 = 2773. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 185 + 830 = 1018. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 55 × 14 = 770. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 686 + 626 = 1310. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 33 × 31 = 1020. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 547 + 940 = 1491. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 570 + 189 = 759. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 584 + 504 = 1088. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 266 + 190 = 456. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 689 + 162 = 851. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 535 + 546 = 1076. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 622 + 938 = 1565. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 56 × 67 = 3752. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 486 + 483 = 969. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 68 × 16 = 1087. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 866 + 448 = 1316. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 71 × 60 = 4254. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 21 × 27 = 567. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 863 + 429 = 1294. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 54 × 50 = 2704. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 372 + 298 = 670. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 19 × 15 = 285. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 87 × 40 = 3480. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 48 × 73 = 3510. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 725 + 673 = 1406. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 19 × 88 = 1672. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 21 = 1643. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 222 + 483 = 707. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 554 + 262 = 821. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 981 + 650 = 1631. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 64 × 42 = 2686. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 280 + 249 = 525. Correct or wrong? (a) wrong (b) correct

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