Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 225 · 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: 12 × 83 = 996. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 672 + 122 = 792. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 885 + 175 = 1052. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 178 + 881 = 1059. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 19 × 91 = 1729. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 58 × 91 = 5279. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 296 + 348 = 644. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 27 × 19 = 507. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 487 + 740 = 1227. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 678 + 156 = 834. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 28 × 49 = 1372. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 247 + 929 = 1176. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 79 × 25 = 1976. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 223 + 634 = 857. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 248 + 145 = 393. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 231 + 213 = 444. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 67 × 70 = 4683. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 335 + 802 = 1137. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 289 + 518 = 806. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 47 × 33 = 1552. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 12 × 74 = 888. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 74 × 44 = 3256. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 58 = 754. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 448 + 832 = 1285. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 411 + 196 = 603. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 99 × 38 = 3762. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 99 × 70 = 6928. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 96 × 26 = 2496. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 885 + 580 = 1468. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 97 × 59 = 5723. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 40 × 20 = 800. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 55 = 3849. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 93 × 40 = 3726. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 50 × 60 = 3000. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 975 + 673 = 1648. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 85 × 23 = 1955. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 59 × 21 = 1239. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 374 + 615 = 981. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 337 + 640 = 977. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 741 + 663 = 1399. Correct or wrong? (a) wrong (b) correct

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