Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 385 · 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: 582 + 446 = 1023. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 82 = 2212. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 130 + 370 = 504. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 583 + 411 = 994. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 17 × 26 = 442. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 71 × 84 = 5964. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 15 = 838. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 28 × 43 = 1212. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 646 + 427 = 1073. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 503 + 608 = 1111. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 729 + 141 = 870. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 78 × 80 = 6240. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 89 × 34 = 3029. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 88 × 28 = 2467. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 753 + 599 = 1355. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 30 = 2576. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 794 + 508 = 1302. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 302 + 894 = 1192. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 69 × 86 = 5940. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 137 + 581 = 721. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 902 + 824 = 1726. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 66 × 30 = 1980. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 219 + 245 = 465. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 250 + 707 = 956. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 184 + 695 = 874. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 909 + 712 = 1621. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 170 + 336 = 507. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 922 + 638 = 1560. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 778 + 838 = 1615. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 769 + 834 = 1603. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 453 + 344 = 794. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 30 × 59 = 1770. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 71 = 6596. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 997 + 838 = 1835. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 33 × 98 = 3234. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 998 + 150 = 1153. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 697 + 952 = 1645. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 93 × 85 = 7905. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 898 + 626 = 1526. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 48 × 12 = 575. Correct or wrong? (a) correct (b) wrong

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