Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 568 · 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: 576 + 646 = 1222. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 31 × 70 = 2170. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 174 + 402 = 576. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 291 + 228 = 521. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 135 + 688 = 818. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 17 × 77 = 1310. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 35 × 44 = 1540. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 87 × 69 = 6004. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 93 × 27 = 2513. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 687 + 727 = 1411. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 38 × 47 = 1786. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 210 + 665 = 876. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 283 + 205 = 492. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 64 × 38 = 2425. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 65 × 72 = 4680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 489 + 208 = 697. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 579 + 278 = 857. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 83 × 90 = 7466. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 913 + 894 = 1807. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 93 × 15 = 1395. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 827 + 707 = 1534. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 36 × 18 = 649. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 91 × 87 = 7917. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 147 + 517 = 664. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 215 + 159 = 374. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 34 × 17 = 576. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 16 × 24 = 384. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 635 + 226 = 861. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 29 × 78 = 2266. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 34 × 19 = 646. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 861 + 354 = 1215. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 47 × 93 = 4371. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 929 + 666 = 1597. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 299 + 533 = 830. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 489 + 170 = 659. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 529 + 252 = 781. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 30 × 66 = 1976. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 500 + 868 = 1364. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 36 = 3384. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 84 × 21 = 1767. Correct or wrong? (a) wrong (b) correct

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