Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 784 · 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: 499 + 253 = 744. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 275 + 289 = 564. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 324 + 365 = 689. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 802 + 990 = 1792. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 272 + 132 = 404. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 641 + 151 = 793. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 31 × 94 = 2914. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 90 × 53 = 4770. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 27 × 55 = 1485. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 61 × 17 = 1031. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 28 × 98 = 2748. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 45 × 20 = 900. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 229 + 620 = 845. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 50 × 32 = 1595. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 150 + 449 = 599. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 755 + 596 = 1351. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 925 + 224 = 1155. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 24 × 62 = 1488. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 72 = 1303. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 202 + 729 = 931. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 724 + 310 = 1034. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 19 × 99 = 1878. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 134 + 357 = 483. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 56 × 20 = 1112. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 61 × 58 = 3543. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 717 + 897 = 1620. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 263 + 196 = 458. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 193 + 962 = 1155. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 417 + 232 = 655. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 18 × 26 = 468. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 63 = 2326. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 49 × 58 = 2847. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 99 × 67 = 6633. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 28 × 14 = 392. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 712 + 741 = 1454. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 46 × 31 = 1426. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 15 × 85 = 1275. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 85 × 87 = 7397. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 289 + 586 = 875. Correct or wrong? (a) correct (b) wrong

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