Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 14 · 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: 895 + 242 = 1130. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 60 × 64 = 3840. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 65 × 17 = 1108. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 52 = 2548. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 32 × 20 = 648. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 709 + 430 = 1145. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 79 × 44 = 3476. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 869 + 356 = 1225. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 595 + 989 = 1591. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 867 + 430 = 1297. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 888 + 951 = 1839. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 72 × 26 = 1872. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 83 × 57 = 4729. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 696 + 999 = 1695. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 957 + 251 = 1208. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 87 × 19 = 1653. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 23 × 61 = 1403. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 283 + 200 = 483. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 72 × 46 = 3312. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 545 + 593 = 1136. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 132 + 750 = 882. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 726 + 593 = 1319. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 22 = 1892. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 78 × 88 = 6864. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 523 + 727 = 1253. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 53 × 25 = 1325. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 38 = 1672. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 80 × 66 = 5281. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 754 + 336 = 1091. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 54 × 21 = 1134. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 49 × 20 = 980. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 917 + 369 = 1286. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 26 × 64 = 1664. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 483 + 568 = 1058. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 99 × 69 = 6838. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 537 + 613 = 1142. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 32 = 1312. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 990 + 175 = 1164. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 444 + 537 = 975. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 818 + 207 = 1029. Correct or wrong? (a) wrong (b) correct

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