Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 529 · 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: 96 × 84 = 8064. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 30 × 48 = 1440. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 26 × 88 = 2288. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 36 × 26 = 934. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 331 + 791 = 1122. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 476 + 809 = 1285. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 417 + 517 = 934. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 565 + 797 = 1360. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 82 × 37 = 3037. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 958 + 939 = 1897. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 93 × 80 = 7434. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 647 + 335 = 980. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 16 = 1408. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 45 × 91 = 4095. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 79 × 20 = 1580. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 368 + 479 = 851. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 61 = 4508. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 432 + 364 = 799. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 26 × 90 = 2340. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 61 × 72 = 4399. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 922 + 894 = 1822. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 980 + 326 = 1299. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 633 + 709 = 1342. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 43 × 69 = 2967. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 95 × 31 = 2945. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 887 + 271 = 1150. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 95 × 52 = 4934. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 83 × 52 = 4320. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 349 + 163 = 515. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 62 = 2356. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 46 × 34 = 1564. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 671 + 784 = 1455. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 26 × 21 = 546. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 869 + 691 = 1564. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 894 + 808 = 1702. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 63 × 60 = 3784. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 34 × 44 = 1503. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 31 = 1426. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 73 × 85 = 6211. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 61 = 3294. Correct or wrong? (a) correct (b) wrong

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