Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 533 · 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: 17 × 34 = 584. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 13 × 16 = 208. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 52 = 1456. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 694 + 440 = 1134. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 653 + 142 = 795. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 474 + 256 = 730. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 84 × 48 = 4039. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 41 × 36 = 1479. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 868 + 974 = 1850. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 20 × 48 = 966. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 36 = 753. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 42 × 35 = 1463. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 39 = 1480. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 49 = 1033. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 77 × 26 = 2002. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 81 × 33 = 2673. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 73 × 48 = 3512. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 79 = 1899. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 671 + 276 = 954. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 52 × 37 = 1924. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 40 × 67 = 2678. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 873 + 631 = 1504. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 35 × 28 = 983. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 807 + 166 = 979. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 457 + 278 = 737. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 23 × 21 = 488. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 755 + 134 = 889. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 68 × 18 = 1232. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 96 = 9408. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 723 + 432 = 1155. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 75 × 63 = 4732. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 59 = 2655. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 90 × 20 = 1800. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 169 + 604 = 775. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 280 + 910 = 1190. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 52 × 47 = 2444. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 68 × 50 = 3400. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 31 × 72 = 2239. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 46 × 46 = 2116. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 30 × 67 = 2004. Correct or wrong? (a) wrong (b) correct

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