Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 560 · 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: 252 + 236 = 488. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 415 + 752 = 1167. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 31 × 49 = 1515. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 64 × 48 = 3080. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 989 + 387 = 1376. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 596 + 659 = 1255. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 278 + 477 = 749. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 28 × 69 = 1933. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 85 = 1694. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 51 × 21 = 1071. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 36 × 30 = 1078. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 941 + 942 = 1883. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 842 + 164 = 1006. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 94 × 19 = 1778. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 77 × 41 = 3150. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 48 × 51 = 2453. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 490 + 379 = 876. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 789 + 780 = 1569. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 20 × 74 = 1480. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 57 × 90 = 5130. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 80 × 76 = 6081. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 98 × 80 = 7840. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 445 + 959 = 1404. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 24 = 908. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 731 + 654 = 1385. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 289 + 409 = 698. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 526 + 942 = 1468. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 75 × 76 = 5695. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 149 + 436 = 587. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 126 + 290 = 416. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 773 + 948 = 1722. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 16 = 592. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 995 + 572 = 1572. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 959 + 476 = 1435. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 515 + 424 = 938. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 21 × 80 = 1680. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 975 + 414 = 1389. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 90 × 88 = 7917. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 45 × 58 = 2610. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 505 + 675 = 1180. Correct or wrong? (a) correct (b) wrong

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