Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 508 · 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: 88 × 68 = 5986. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 217 + 999 = 1213. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 61 × 70 = 4275. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 521 + 963 = 1484. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 167 + 378 = 545. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 69 × 36 = 2480. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 41 × 79 = 3239. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 710 + 341 = 1054. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 27 × 83 = 2241. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 598 + 911 = 1512. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 720 + 716 = 1436. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 75 × 98 = 7350. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 552 + 603 = 1149. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 59 × 27 = 1593. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 34 = 2932. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 67 = 1876. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 99 × 33 = 3267. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 76 × 93 = 7068. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 123 + 526 = 649. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 49 = 4165. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 85 × 49 = 4165. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 25 × 54 = 1350. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 82 × 35 = 2862. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 338 + 307 = 645. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 240 + 288 = 528. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 42 × 92 = 3864. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 23 = 2001. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 981 + 987 = 1971. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 68 × 80 = 5444. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 24 × 48 = 1152. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 24 = 1888. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 90 × 27 = 2432. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 30 × 12 = 352. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 434 + 933 = 1367. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 583 + 431 = 1017. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 694 + 368 = 1062. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 57 = 5076. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 212 + 684 = 888. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 21 = 2037. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 31 × 32 = 992. Correct or wrong? (a) wrong (b) correct

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