Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 293 · 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: 244 + 374 = 618. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 22 × 23 = 506. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 34 = 952. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 244 + 588 = 828. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 73 × 22 = 1605. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 91 × 47 = 4274. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 507 + 530 = 1036. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 371 + 218 = 590. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 42 × 66 = 2775. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 47 × 49 = 2300. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 515 + 529 = 1044. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 979 + 535 = 1514. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 51 × 48 = 2448. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 24 × 50 = 1200. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 256 + 237 = 493. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 48 × 79 = 3792. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 97 × 92 = 8924. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 232 + 612 = 837. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 20 × 56 = 1128. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 299 + 354 = 653. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 541 + 825 = 1366. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 199 + 861 = 1060. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 549 + 236 = 785. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 72 × 94 = 6768. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 83 × 37 = 3071. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 683 + 365 = 1048. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 53 × 28 = 1484. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 428 + 451 = 879. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 35 = 1217. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 60 = 1680. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 284 + 701 = 979. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 724 + 338 = 1069. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 98 × 77 = 7546. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 20 × 89 = 1774. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 87 × 56 = 4872. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 147 + 206 = 353. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 42 × 33 = 1386. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 924 + 313 = 1237. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 52 × 15 = 780. Correct or wrong? (a) wrong (b) correct

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