Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 785 · 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: 615 + 930 = 1545. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 88 × 41 = 3608. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 65 = 1040. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 68 × 99 = 6732. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 90 × 74 = 6665. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 126 + 585 = 719. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 15 × 36 = 535. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 47 × 21 = 986. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 23 × 75 = 1725. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 82 × 50 = 4100. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 59 × 27 = 1597. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 49 × 67 = 3277. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 98 = 8616. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 34 × 58 = 1972. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 690 + 448 = 1138. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 94 × 58 = 5459. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 63 × 41 = 2583. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 75 × 52 = 3898. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 54 × 64 = 3456. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 163 + 654 = 815. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 706 + 356 = 1065. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 72 × 63 = 4541. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 53 × 63 = 3345. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 81 × 83 = 6723. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 722 + 190 = 912. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 810 + 181 = 991. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 63 × 24 = 1512. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 832 + 564 = 1396. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 13 × 40 = 520. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 70 × 34 = 2378. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 237 + 304 = 541. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 797 + 302 = 1099. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 166 + 169 = 335. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 904 + 606 = 1513. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 94 × 72 = 6768. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 67 × 59 = 3953. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 55 × 97 = 5335. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 128 + 517 = 649. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 91 × 77 = 7007. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 86 × 36 = 3096. Correct or wrong? (a) wrong (b) correct

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