Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 153 · 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: 26 × 17 = 442. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 406 + 147 = 553. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 97 = 5529. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 155 + 605 = 760. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 88 × 73 = 6417. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 93 × 99 = 9207. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 81 × 16 = 1290. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 12 × 61 = 734. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 48 × 62 = 2976. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 88 = 4401. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 47 = 2209. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 26 × 62 = 1612. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 78 × 74 = 5771. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 527 + 223 = 750. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 864 + 700 = 1564. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 24 = 1440. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 41 = 1394. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 326 + 538 = 864. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 998 + 730 = 1732. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 75 × 76 = 5700. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 88 × 88 = 7748. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 26 × 72 = 1872. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 35 × 90 = 3150. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 36 × 49 = 1764. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 314 + 304 = 618. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 78 = 3743. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 99 × 12 = 1188. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 23 × 63 = 1449. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 59 × 59 = 3481. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 702 + 819 = 1521. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 738 + 918 = 1656. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 733 + 269 = 1002. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 763 + 631 = 1394. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 20 × 78 = 1558. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 37 × 69 = 2560. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 41 = 3116. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 399 + 312 = 711. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 79 × 65 = 5130. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 257 + 160 = 417. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 771 + 161 = 932. Correct or wrong? (a) correct (b) wrong

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