Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 925 · 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: 29 × 36 = 1045. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 533 + 784 = 1315. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 316 + 593 = 909. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 210 + 312 = 519. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 778 + 317 = 1090. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 24 × 83 = 1990. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 40 = 1200. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 45 × 86 = 3870. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 78 × 99 = 7722. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 762 + 833 = 1589. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 336 + 611 = 947. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 803 + 127 = 930. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 18 = 365. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 954 + 467 = 1421. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 170 + 219 = 389. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 75 × 87 = 6525. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 99 × 31 = 3064. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 15 × 29 = 435. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 694 + 576 = 1270. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 39 × 13 = 507. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 59 × 95 = 5605. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 198 + 929 = 1127. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 89 × 44 = 3916. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 849 + 179 = 1031. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 97 × 75 = 7281. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 63 × 48 = 3019. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 56 × 34 = 1904. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 580 + 511 = 1091. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 305 + 453 = 758. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 81 × 29 = 2355. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 315 + 642 = 960. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 605 + 594 = 1204. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 130 + 281 = 411. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 90 × 46 = 4146. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 44 × 40 = 1766. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 81 × 37 = 2997. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 95 × 89 = 8457. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 34 × 74 = 2516. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 996 + 903 = 1899. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 63 × 69 = 4347. Correct or wrong? (a) correct (b) wrong

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