Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 761 · 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: 670 + 387 = 1063. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 37 = 3626. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 68 × 84 = 5712. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 47 × 23 = 1081. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 92 × 94 = 8648. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 472 + 187 = 659. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 91 = 2730. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 517 + 266 = 779. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 94 = 2624. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 194 + 879 = 1080. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 43 × 92 = 3956. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 54 = 865. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 57 × 18 = 1026. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 643 + 664 = 1307. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 48 × 70 = 3360. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 16 = 1564. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 41 × 26 = 1063. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 90 × 69 = 6202. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 28 = 1764. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 500 + 260 = 760. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 18 × 30 = 540. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 25 × 27 = 669. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 81 × 75 = 6075. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 585 + 707 = 1292. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 43 × 87 = 3740. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 607 + 388 = 995. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 58 × 13 = 756. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 847 + 574 = 1421. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 434 + 709 = 1143. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 876 + 971 = 1842. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 46 = 3626. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 82 = 2706. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 367 + 408 = 779. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 202 + 952 = 1157. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 75 × 50 = 3748. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 18 × 80 = 1448. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 18 × 86 = 1548. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 901 + 691 = 1592. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 44 × 15 = 660. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 71 × 95 = 6739. Correct or wrong? (a) correct (b) wrong

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