Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 77 · 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: 264 + 191 = 455. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 33 × 99 = 3267. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 43 × 20 = 860. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 72 × 88 = 6336. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 54 × 26 = 1404. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 718 + 429 = 1147. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 96 × 48 = 4608. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 343 + 744 = 1089. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 741 + 403 = 1148. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 60 = 3006. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 37 × 35 = 1295. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 675 + 166 = 840. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 90 × 40 = 3600. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 44 × 38 = 1672. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 93 × 26 = 2418. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 53 = 1484. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 680 + 375 = 1055. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 63 × 86 = 5418. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 29 × 21 = 609. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 59 × 14 = 832. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 12 = 1056. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 93 = 1209. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 14 × 98 = 1372. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 41 = 570. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 717 + 488 = 1205. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 34 × 13 = 440. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 671 + 520 = 1183. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 367 + 158 = 530. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 77 × 68 = 5241. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 516 + 807 = 1323. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 22 × 85 = 1869. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 25 = 1150. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 18 × 87 = 1571. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 525 + 283 = 809. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 55 × 17 = 935. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 44 × 37 = 1627. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 78 × 65 = 5070. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 627 + 202 = 829. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 826 + 470 = 1296. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 19 × 58 = 1102. Correct or wrong? (a) wrong (b) correct

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