Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 922 · 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: 921 + 522 = 1437. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 60 × 88 = 5280. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 20 × 72 = 1440. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 28 × 66 = 1853. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 31 = 2482. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 93 × 86 = 7998. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 237 + 506 = 741. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 50 × 82 = 4100. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 760 + 866 = 1626. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 695 + 884 = 1579. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 17 × 23 = 397. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 17 × 55 = 935. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 902 + 276 = 1181. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 79 × 57 = 4499. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 65 × 91 = 5909. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 73 × 51 = 3723. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 74 × 47 = 3478. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 60 × 71 = 4252. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 42 × 46 = 1932. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 70 × 38 = 2652. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 40 × 91 = 3638. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 42 = 546. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 936 + 706 = 1642. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 628 + 379 = 1015. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 642 + 645 = 1287. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 17 × 89 = 1513. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 809 + 336 = 1145. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 69 × 85 = 5866. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 579 + 372 = 949. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 89 × 81 = 7206. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 26 × 35 = 908. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 23 × 20 = 460. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 86 = 4988. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 44 = 3689. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 75 × 94 = 7042. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 84 × 63 = 5292. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 271 + 392 = 669. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 268 + 458 = 728. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 191 + 395 = 586. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 96 × 29 = 2784. Correct or wrong? (a) correct (b) wrong

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