Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 296 · 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: 669 + 246 = 915. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 445 + 227 = 670. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 163 + 602 = 760. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 42 × 56 = 2360. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 495 + 341 = 837. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 34 = 3056. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 903 + 121 = 1017. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 45 × 78 = 3510. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 30 × 28 = 840. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 864 + 454 = 1318. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 829 + 396 = 1225. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 585 + 874 = 1459. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 29 × 74 = 2149. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 29 × 70 = 2037. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 780 + 580 = 1360. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 17 × 92 = 1564. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 267 + 346 = 613. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 757 + 716 = 1473. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 98 × 37 = 3631. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 72 × 15 = 1085. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 619 + 298 = 917. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 620 + 462 = 1082. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 905 + 756 = 1661. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 839 + 942 = 1782. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 260 + 718 = 978. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 69 × 48 = 3316. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 924 + 581 = 1505. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 89 × 89 = 7921. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 15 × 91 = 1362. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 730 + 210 = 940. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 83 × 96 = 7969. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 863 + 601 = 1456. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 731 + 269 = 1000. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 66 × 71 = 4686. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 90 × 25 = 2250. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 830 + 365 = 1195. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 715 + 781 = 1491. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 93 × 70 = 6509. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 622 + 502 = 1124. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 30 × 73 = 2190. Correct or wrong? (a) correct (b) wrong

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