Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 83 · 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: 97 × 15 = 1455. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 405 + 791 = 1196. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 889 + 946 = 1835. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 26 × 82 = 2132. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 64 × 72 = 4608. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 892 + 940 = 1832. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 900 + 421 = 1321. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 838 + 129 = 971. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 38 × 43 = 1637. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 17 × 30 = 510. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 500 + 976 = 1476. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 474 + 643 = 1114. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 55 × 94 = 5176. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 877 + 522 = 1399. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 649 + 688 = 1342. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 47 = 4089. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 91 × 30 = 2724. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 74 × 61 = 4514. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 55 × 92 = 5060. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 869 + 424 = 1288. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 65 × 33 = 2145. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 231 + 585 = 816. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 276 + 662 = 941. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 76 × 81 = 6162. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 697 + 864 = 1568. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 34 × 79 = 2678. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 624 + 545 = 1169. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 26 × 36 = 936. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 48 = 2736. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 44 = 1452. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 951 + 500 = 1444. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 473 + 276 = 749. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 29 × 18 = 517. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 439 + 165 = 601. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 55 × 46 = 2527. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 307 + 588 = 891. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 509 + 588 = 1089. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 964 + 573 = 1537. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 31 = 2919. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 663 + 946 = 1612. Correct or wrong? (a) wrong (b) correct

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