Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 448 · 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: 71 × 86 = 6106. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 739 + 680 = 1419. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 515 + 404 = 921. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 74 × 93 = 6882. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 17 × 34 = 586. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 83 × 43 = 3569. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 66 × 61 = 4027. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 72 × 29 = 2082. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 634 + 563 = 1197. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 51 × 73 = 3723. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 714 + 440 = 1154. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 25 × 67 = 1675. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 35 × 66 = 2310. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 125 + 751 = 874. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 85 × 40 = 3400. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 395 + 709 = 1097. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 687 + 226 = 908. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 38 × 20 = 760. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 877 + 574 = 1448. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 269 + 193 = 462. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 446 + 676 = 1122. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 128 + 468 = 597. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 306 + 797 = 1103. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 33 × 76 = 2502. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 59 × 53 = 3127. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 386 + 237 = 623. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 27 × 56 = 1513. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 70 × 61 = 4277. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 27 × 60 = 1620. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 48 × 80 = 3840. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 222 + 579 = 807. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 20 = 1133. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 99 × 44 = 4356. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 98 = 3522. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 508 + 177 = 683. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 910 + 322 = 1227. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 89 × 92 = 8188. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 22 = 284. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 895 + 286 = 1181. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 93 × 21 = 1950. Correct or wrong? (a) correct (b) wrong

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