Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 402 · 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: 162 + 731 = 893. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 25 × 23 = 575. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 741 + 215 = 949. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 53 × 35 = 1855. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 787 + 616 = 1403. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 652 + 355 = 1007. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 362 + 143 = 505. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 41 × 87 = 3562. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 85 × 97 = 8237. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 243 + 961 = 1204. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 64 = 3520. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 31 × 28 = 861. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 64 × 84 = 5376. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 99 × 99 = 9799. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 41 = 3772. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 38 × 46 = 1742. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 729 + 910 = 1639. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 13 × 76 = 988. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 801 + 534 = 1335. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 35 × 17 = 595. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 26 × 75 = 1953. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 62 × 84 = 5205. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 386 + 597 = 983. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 337 + 480 = 821. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 811 + 234 = 1045. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 631 + 773 = 1408. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 64 × 65 = 4166. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 86 × 22 = 1891. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 34 × 27 = 918. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 794 + 580 = 1374. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 124 + 933 = 1057. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 30 × 75 = 2250. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 922 + 192 = 1106. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 95 × 22 = 2090. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 44 × 63 = 2777. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 23 × 47 = 1081. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 894 + 406 = 1305. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 656 + 525 = 1181. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 21 × 63 = 1323. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 30 × 90 = 2700. Correct or wrong? (a) wrong (b) correct

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