Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 562 · 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: 21 × 95 = 1995. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 94 × 80 = 7514. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 33 × 51 = 1683. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 478 + 562 = 1040. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 565 + 617 = 1182. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 91 = 8002. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 81 × 20 = 1620. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 559 + 447 = 1001. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 220 + 928 = 1156. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 498 + 227 = 725. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 23 = 779. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 68 = 4964. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 52 × 19 = 982. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 836 + 407 = 1243. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 583 + 888 = 1473. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 563 + 986 = 1549. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 266 + 708 = 974. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 66 × 30 = 1986. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 257 + 809 = 1067. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 666 + 353 = 1021. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 669 + 180 = 842. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 88 × 34 = 2992. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 67 × 59 = 3953. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 558 + 406 = 964. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 65 × 73 = 4745. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 16 × 30 = 480. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 80 × 98 = 7847. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 972 + 201 = 1176. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 94 × 17 = 1597. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 97 × 21 = 2037. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 61 × 81 = 4941. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 33 × 18 = 594. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 378 + 618 = 990. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 478 + 515 = 993. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 833 + 923 = 1761. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 67 × 31 = 2077. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 36 × 85 = 3060. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 558 + 375 = 933. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 71 × 20 = 1420. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 249 + 809 = 1058. Correct or wrong? (a) correct (b) wrong

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