Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 461 · 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: 16 × 73 = 1171. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 34 × 99 = 3372. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 12 × 45 = 540. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 70 = 3850. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 16 = 687. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 65 × 89 = 5785. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 998 + 432 = 1431. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 26 × 16 = 416. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 60 × 46 = 2760. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 190 + 541 = 731. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 59 × 47 = 2778. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 568 + 329 = 895. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 52 × 75 = 3908. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 234 + 784 = 1018. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 682 + 249 = 931. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 30 × 37 = 1118. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 366 + 251 = 617. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 874 + 984 = 1855. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 376 + 384 = 754. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 245 + 529 = 774. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 92 × 30 = 2762. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 299 + 874 = 1181. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 99 × 84 = 8317. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 74 = 1036. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 32 × 55 = 1760. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 217 + 474 = 691. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 702 + 260 = 969. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 81 = 1626. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 391 + 893 = 1284. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 229 + 727 = 954. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 226 + 898 = 1124. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 71 × 42 = 2982. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 681 + 430 = 1115. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 54 × 76 = 4110. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 43 × 58 = 2494. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 66 × 86 = 5674. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 189 + 273 = 462. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 276 + 723 = 999. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 59 = 4485. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 333 + 122 = 457. Correct or wrong? (a) correct (b) wrong

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