Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 141 · 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: 261 + 186 = 448. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 938 + 337 = 1275. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 88 × 56 = 4930. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 67 = 1281. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 389 + 251 = 640. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 359 + 332 = 693. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 95 × 47 = 4459. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 86 × 59 = 5072. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 45 × 33 = 1487. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 51 × 31 = 1586. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 35 × 70 = 2446. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 21 × 20 = 420. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 515 + 372 = 887. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 50 × 45 = 2250. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 13 × 63 = 824. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 23 × 40 = 921. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 33 × 28 = 924. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 858 + 160 = 1018. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 158 + 231 = 381. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 71 × 72 = 5115. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 68 × 65 = 4421. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 86 × 34 = 2922. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 14 = 196. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 933 + 442 = 1374. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 30 × 91 = 2730. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 15 × 27 = 404. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 81 × 42 = 3401. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 411 + 585 = 1001. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 334 + 643 = 977. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 850 + 953 = 1800. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 41 = 3731. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 55 × 55 = 3025. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 81 × 21 = 1701. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 736 + 759 = 1495. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 207 + 418 = 625. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 475 + 493 = 968. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 44 × 83 = 3646. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 76 × 29 = 2202. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 926 + 569 = 1495. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 17 × 85 = 1448. Correct or wrong? (a) wrong (b) correct

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