Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 662 · 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: 454 + 251 = 705. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 66 × 27 = 1785. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 21 × 67 = 1409. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 59 × 12 = 715. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 190 + 908 = 1106. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 59 × 95 = 5605. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 84 = 2856. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 603 + 245 = 856. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 243 + 621 = 864. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 997 + 198 = 1200. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 460 + 818 = 1278. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 39 × 66 = 2574. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 319 + 518 = 837. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 875 + 564 = 1439. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 86 = 7998. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 55 = 4238. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 181 + 947 = 1128. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 378 + 210 = 593. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 940 + 577 = 1517. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 83 × 34 = 2829. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 96 × 59 = 5657. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 30 × 93 = 2785. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 50 × 75 = 3750. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 93 × 52 = 4832. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 986 + 888 = 1873. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 387 + 530 = 918. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 78 = 2108. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 911 + 561 = 1472. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 161 + 859 = 1020. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 646 + 291 = 937. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 368 + 316 = 679. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 705 + 175 = 881. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 39 × 98 = 3822. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 92 = 2852. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 83 × 32 = 2654. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 51 × 38 = 1934. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 949 + 763 = 1718. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 555 + 218 = 781. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 74 × 91 = 6734. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 39 × 95 = 3702. Correct or wrong? (a) wrong (b) correct

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