Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 799 · 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: 96 × 71 = 6816. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 986 + 186 = 1180. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 178 + 964 = 1140. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 39 × 67 = 2613. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 416 + 213 = 629. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 24 × 34 = 809. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 624 + 928 = 1559. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 41 × 34 = 1394. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 523 + 869 = 1391. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 78 = 4602. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 675 + 922 = 1597. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 24 × 43 = 1032. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 41 × 78 = 3198. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 899 + 477 = 1376. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 98 × 44 = 4314. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 940 + 998 = 1938. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 57 × 79 = 4503. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 68 × 57 = 3879. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 475 + 867 = 1340. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 723 + 245 = 968. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 87 × 33 = 2878. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 787 + 662 = 1446. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 80 × 54 = 4320. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 80 = 1120. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 96 × 35 = 3367. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 254 + 221 = 475. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 31 = 2669. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 59 = 708. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 605 + 723 = 1330. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 37 × 88 = 3256. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 47 = 941. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 72 × 61 = 4392. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 34 × 91 = 3090. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 608 + 321 = 926. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 752 + 471 = 1219. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 35 × 63 = 2205. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 962 + 295 = 1257. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 976 + 890 = 1866. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 128 + 651 = 772. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 99 × 77 = 7623. Correct or wrong? (a) correct (b) wrong

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