Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 26 · 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: 53 × 52 = 2759. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 24 × 90 = 2160. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 144 + 445 = 581. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 564 + 509 = 1073. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 642 + 241 = 883. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 55 × 94 = 5167. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 292 + 564 = 856. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 381 + 143 = 524. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 50 × 22 = 1096. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 96 × 41 = 3936. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 24 × 68 = 1634. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 662 + 847 = 1509. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 25 × 57 = 1425. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 58 × 98 = 5684. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 99 × 53 = 5241. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 673 + 397 = 1070. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 297 + 887 = 1184. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 522 + 633 = 1155. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 229 + 595 = 819. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 30 × 73 = 2190. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 43 × 37 = 1591. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 295 + 971 = 1265. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 98 × 76 = 7442. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 27 × 71 = 1925. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 532 + 335 = 875. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 772 + 891 = 1663. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 845 + 573 = 1418. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 591 + 494 = 1090. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 44 × 50 = 2200. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 518 + 375 = 895. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 729 + 676 = 1407. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 91 = 3088. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 198 + 402 = 600. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 146 + 758 = 909. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 98 × 98 = 9604. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 326 + 295 = 613. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 24 × 76 = 1824. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 51 × 34 = 1734. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 96 × 79 = 7584. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 323 + 572 = 895. Correct or wrong? (a) correct (b) wrong

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