Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 698 · 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: 888 + 636 = 1522. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 569 + 707 = 1276. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 56 = 1571. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 913 + 376 = 1289. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 39 × 77 = 3006. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 265 + 314 = 574. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 88 × 25 = 2200. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 34 × 63 = 2138. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 834 + 630 = 1464. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 75 × 27 = 2028. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 269 + 787 = 1048. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 755 + 657 = 1410. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 48 × 37 = 1776. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 372 + 679 = 1051. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 85 = 3995. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 578 + 731 = 1303. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 52 = 1820. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 755 + 597 = 1354. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 987 + 973 = 1960. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 365 + 826 = 1198. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 231 + 973 = 1204. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 29 × 24 = 703. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 12 × 85 = 1020. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 504 + 768 = 1279. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 61 × 47 = 2865. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 557 + 790 = 1351. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 581 + 470 = 1055. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 690 + 606 = 1296. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 73 = 6278. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 694 + 245 = 932. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 12 = 492. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 227 + 809 = 1036. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 830 + 836 = 1672. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 50 = 850. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 32 × 36 = 1152. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 282 + 263 = 539. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 65 × 56 = 3640. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 22 × 21 = 470. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 664 + 859 = 1523. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 59 × 67 = 3953. Correct or wrong? (a) correct (b) wrong

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