Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 206 · 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 × 29 = 2784. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 849 + 327 = 1176. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 225 + 909 = 1134. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 734 + 744 = 1485. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 829 + 824 = 1652. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 881 + 792 = 1673. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 197 + 724 = 921. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 47 × 18 = 839. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 65 × 73 = 4747. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 212 + 207 = 418. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 63 × 84 = 5288. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 158 + 836 = 994. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 998 + 838 = 1836. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 710 + 910 = 1620. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 158 + 633 = 791. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 388 + 133 = 525. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 50 × 93 = 4647. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 332 + 957 = 1289. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 415 + 170 = 585. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 45 × 56 = 2516. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 66 × 14 = 924. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 19 × 23 = 437. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 71 × 53 = 3763. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 805 + 393 = 1202. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 450 + 247 = 697. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 23 = 1748. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 15 = 330. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 35 × 65 = 2274. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 14 × 71 = 994. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 47 = 1551. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 78 × 73 = 5694. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 927 + 791 = 1718. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 827 + 716 = 1543. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 376 + 547 = 927. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 262 + 296 = 550. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 211 + 518 = 729. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 62 = 1487. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 31 × 56 = 1736. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 377 + 294 = 671. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 826 + 327 = 1151. Correct or wrong? (a) wrong (b) correct

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