Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 413 · 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: 24 × 65 = 1560. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 33 × 40 = 1320. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 547 + 450 = 1005. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 47 × 40 = 1887. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 26 × 90 = 2342. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 26 × 75 = 1958. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 24 × 68 = 1632. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 37 × 19 = 696. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 483 + 508 = 991. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 662 + 895 = 1557. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 437 + 314 = 751. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 885 + 673 = 1550. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 61 × 16 = 968. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 22 × 32 = 704. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 769 + 232 = 993. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 67 × 20 = 1341. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 643 + 398 = 1045. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 99 × 15 = 1488. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 966 + 149 = 1115. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 91 = 2912. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 28 × 73 = 2036. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 53 × 67 = 3545. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 36 × 67 = 2412. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 613 + 383 = 996. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 207 + 717 = 924. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 60 × 14 = 840. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 89 × 53 = 4719. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 57 × 25 = 1432. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 516 + 524 = 1040. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 897 + 598 = 1500. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 284 + 869 = 1153. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 833 + 692 = 1532. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 885 + 715 = 1600. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 784 + 367 = 1147. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 22 × 76 = 1670. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 63 × 68 = 4277. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 92 × 96 = 8829. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 421 + 186 = 601. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 67 = 4618. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 35 × 45 = 1568. Correct or wrong? (a) wrong (b) correct

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