Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 325 · 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: 57 × 88 = 5014. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 31 × 69 = 2140. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 379 + 221 = 600. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 45 × 15 = 675. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 241 + 946 = 1189. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 13 × 68 = 889. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 33 × 85 = 2805. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 50 × 83 = 4158. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 893 + 470 = 1365. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 545 + 927 = 1472. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 84 × 76 = 6384. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 355 + 261 = 617. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 35 × 45 = 1580. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 85 × 51 = 4337. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 88 × 39 = 3428. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 34 × 63 = 2142. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 518 + 977 = 1487. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 68 × 14 = 952. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 30 × 82 = 2460. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 587 + 354 = 941. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 49 × 46 = 2261. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 42 = 966. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 923 + 534 = 1457. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 45 × 12 = 540. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 14 × 42 = 582. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 63 × 68 = 4281. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 30 = 870. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 34 × 60 = 2034. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 81 × 44 = 3564. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 12 × 13 = 156. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 15 × 67 = 1002. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 652 + 335 = 985. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 795 + 913 = 1703. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 35 = 3185. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 31 × 89 = 2759. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 676 + 460 = 1136. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 254 + 672 = 926. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 42 × 53 = 2225. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 431 + 550 = 981. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 276 + 604 = 881. Correct or wrong? (a) wrong (b) correct

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