Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 811 · 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: 938 + 502 = 1437. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 70 × 41 = 2870. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 370 + 731 = 1095. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 777 + 591 = 1369. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 40 × 98 = 3925. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 47 × 32 = 1505. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 612 + 485 = 1097. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 52 × 31 = 1606. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 18 × 59 = 1064. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 32 × 44 = 1403. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 72 × 99 = 7129. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 90 × 40 = 3600. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 60 × 95 = 5698. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 97 × 78 = 7566. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 555 + 628 = 1183. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 67 × 26 = 1750. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 80 × 31 = 2472. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 705 + 178 = 891. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 40 × 21 = 838. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 59 × 68 = 4012. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 933 + 720 = 1652. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 47 × 67 = 3147. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 48 × 59 = 2832. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 99 × 73 = 7227. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 39 × 54 = 2106. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 42 × 92 = 3865. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 512 + 176 = 688. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 87 = 1218. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 32 × 44 = 1406. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 130 + 257 = 387. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 41 × 97 = 3969. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 66 × 26 = 1716. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 771 + 936 = 1699. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 520 + 146 = 674. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 83 × 41 = 3396. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 147 + 237 = 390. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 189 + 496 = 682. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 148 + 455 = 603. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 50 × 83 = 4150. Correct or wrong? (a) wrong (b) correct

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