Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 52 · 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: 35 × 50 = 1750. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 443 + 864 = 1307. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 62 × 34 = 2101. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 75 × 29 = 2178. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 938 + 631 = 1569. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 65 × 94 = 6110. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 765 + 800 = 1565. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 925 + 366 = 1294. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 680 + 232 = 912. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 36 × 46 = 1656. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 17 × 17 = 289. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 79 × 28 = 2206. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 50 × 35 = 1750. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 90 × 61 = 5495. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 81 = 7526. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 47 × 26 = 1222. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 17 × 30 = 511. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 20 × 78 = 1552. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 79 × 64 = 5056. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 271 + 523 = 802. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 19 × 40 = 765. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 857 + 677 = 1534. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 193 + 730 = 923. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 61 × 17 = 1037. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 57 × 32 = 1824. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 21 × 31 = 655. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 134 + 332 = 471. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 13 × 38 = 494. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 290 + 290 = 587. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 612 + 333 = 945. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 28 × 87 = 2436. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 26 × 28 = 728. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 862 + 750 = 1613. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 51 × 13 = 663. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 881 + 300 = 1181. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 52 × 86 = 4472. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 26 × 53 = 1378. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 33 × 49 = 1617. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 21 × 99 = 2079. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 797 + 848 = 1645. Correct or wrong? (a) correct (b) wrong

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