Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 419 · 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: 517 + 203 = 713. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 23 = 1633. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 574 + 795 = 1369. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 199 + 809 = 1008. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 68 × 20 = 1357. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 97 = 1255. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 22 × 35 = 778. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 805 + 686 = 1493. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 91 × 23 = 2095. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 966 + 676 = 1642. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 799 + 920 = 1719. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 96 × 84 = 8064. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 97 × 28 = 2716. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 16 × 69 = 1104. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 58 = 3541. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 12 × 91 = 1092. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 60 × 96 = 5760. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 536 + 717 = 1257. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 718 + 955 = 1673. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 872 + 233 = 1097. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 198 + 665 = 863. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 947 + 149 = 1090. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 73 × 12 = 874. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 81 × 48 = 3888. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 55 × 48 = 2644. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 429 + 427 = 856. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 602 + 560 = 1162. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 134 + 221 = 349. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 296 + 545 = 835. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 37 × 15 = 555. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 90 = 1350. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 84 × 62 = 5215. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 43 × 72 = 3096. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 49 × 65 = 3185. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 422 + 388 = 810. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 46 × 76 = 3500. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 20 × 26 = 520. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 61 × 82 = 5002. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 63 × 38 = 2401. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 88 × 88 = 7744. Correct or wrong? (a) correct (b) wrong

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