Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 691 · 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: 44 × 26 = 1147. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 90 × 35 = 3150. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 18 × 75 = 1350. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 599 + 994 = 1597. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 782 + 250 = 1032. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 529 + 432 = 961. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 35 × 59 = 2064. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 314 + 484 = 800. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 68 × 29 = 1972. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 491 + 226 = 724. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 840 + 366 = 1206. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 312 + 572 = 884. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 41 × 90 = 3690. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 24 × 55 = 1314. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 50 × 53 = 2645. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 424 + 725 = 1155. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 969 + 158 = 1127. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 487 + 928 = 1415. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 656 + 302 = 964. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 156 + 894 = 1050. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 52 × 73 = 3796. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 197 + 795 = 992. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 901 + 932 = 1833. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 79 × 37 = 2923. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 419 + 780 = 1205. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 58 × 48 = 2777. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 659 + 866 = 1525. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 32 × 23 = 736. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 23 × 33 = 759. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 266 + 226 = 492. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 53 × 57 = 3025. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 332 + 306 = 638. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 56 × 64 = 3588. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 55 × 27 = 1485. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 343 + 293 = 636. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 31 × 46 = 1421. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 417 + 805 = 1218. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 25 × 84 = 2106. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 36 × 81 = 2916. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 312 + 910 = 1222. Correct or wrong? (a) wrong (b) correct

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