Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 285 · 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: 200 + 344 = 544. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 353 + 344 = 697. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 85 × 67 = 5695. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 275 + 169 = 445. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 86 × 30 = 2586. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 964 + 205 = 1171. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 13 × 48 = 624. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 814 + 272 = 1078. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 95 × 32 = 3046. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 711 + 919 = 1636. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 37 × 93 = 3441. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 209 + 288 = 501. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 95 × 17 = 1621. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 276 + 435 = 711. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 257 + 869 = 1124. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 18 × 68 = 1227. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 60 × 21 = 1252. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 76 × 19 = 1444. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 180 + 599 = 786. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 93 × 22 = 2050. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 997 + 702 = 1699. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 52 × 20 = 1041. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 61 = 2982. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 764 + 198 = 970. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 27 × 88 = 2376. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 47 × 20 = 944. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 74 × 75 = 5544. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 37 × 99 = 3661. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 67 × 67 = 4482. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 888 + 354 = 1242. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 30 × 57 = 1710. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 180 + 738 = 918. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 52 × 39 = 2028. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 596 + 740 = 1343. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 407 + 920 = 1327. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 689 + 890 = 1579. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 606 + 799 = 1409. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 252 + 790 = 1050. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 765 + 791 = 1556. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 311 + 435 = 749. Correct or wrong? (a) wrong (b) correct

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