Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 779 · 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: 458 + 402 = 860. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 71 × 73 = 5183. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 90 × 76 = 6846. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 832 + 302 = 1131. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 522 + 483 = 1003. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 43 = 1505. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 742 + 126 = 870. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 39 × 20 = 780. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 62 × 42 = 2603. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 252 + 803 = 1058. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 19 × 91 = 1729. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 373 + 671 = 1045. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 61 = 3355. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 413 + 270 = 678. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 33 × 52 = 1722. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 367 + 724 = 1089. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 27 × 37 = 999. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 820 + 403 = 1228. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 817 + 410 = 1219. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 401 + 601 = 1008. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 52 = 3588. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 938 + 706 = 1647. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 89 × 74 = 6586. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 767 + 188 = 956. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 645 + 494 = 1144. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 29 × 98 = 2848. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 51 × 27 = 1377. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 80 × 22 = 1760. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 21 × 13 = 270. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 188 + 592 = 780. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 37 × 18 = 666. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 32 × 44 = 1408. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 22 × 16 = 354. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 84 × 54 = 4536. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 73 × 59 = 4307. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 23 × 31 = 721. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 73 = 1898. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 678 + 377 = 1051. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 307 + 238 = 541. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 97 × 29 = 2805. Correct or wrong? (a) wrong (b) correct

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