Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 403 · 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: 836 + 417 = 1248. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 525 + 202 = 727. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 310 + 808 = 1118. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 50 × 37 = 1850. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 210 + 637 = 847. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 419 + 441 = 868. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 46 × 60 = 2760. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 94 × 51 = 4794. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 821 + 631 = 1451. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 51 × 47 = 2397. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 53 × 70 = 3713. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 231 + 993 = 1224. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 421 + 521 = 950. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 32 × 81 = 2584. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 68 × 86 = 5842. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 94 × 64 = 6016. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 130 + 858 = 982. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 236 + 514 = 753. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 247 + 455 = 698. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 62 × 89 = 5518. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 77 × 38 = 2926. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 307 + 461 = 768. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 80 × 82 = 6552. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 659 + 228 = 887. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 275 + 142 = 413. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 350 + 979 = 1329. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 74 = 5113. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 527 + 267 = 792. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 721 + 606 = 1332. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 81 × 23 = 1864. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 594 + 449 = 1037. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 21 = 907. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 28 × 18 = 504. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 14 × 14 = 197. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 96 × 69 = 6624. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 284 + 757 = 1037. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 343 + 201 = 544. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 34 × 62 = 2108. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 67 × 42 = 2814. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 173 + 126 = 299. Correct or wrong? (a) wrong (b) correct

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