Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 803 · 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: 335 + 953 = 1288. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 338 + 522 = 866. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 12 × 32 = 385. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 45 × 73 = 3292. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 603 + 822 = 1427. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 553 + 536 = 1089. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 86 × 12 = 1035. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 334 + 172 = 510. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 802 + 303 = 1112. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 396 + 973 = 1364. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 73 × 52 = 3796. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 585 + 618 = 1210. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 21 × 20 = 412. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 23 × 40 = 923. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 851 + 387 = 1238. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 351 + 292 = 643. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 29 = 1542. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 221 + 856 = 1077. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 843 + 833 = 1678. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 42 × 78 = 3282. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 30 × 26 = 780. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 331 + 613 = 936. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 800 + 362 = 1161. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 96 × 87 = 8352. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 871 + 165 = 1035. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 83 × 51 = 4240. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 965 + 594 = 1560. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 633 + 572 = 1198. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 30 × 29 = 870. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 359 + 243 = 607. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 879 + 694 = 1573. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 158 + 708 = 869. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 964 + 121 = 1085. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 91 × 63 = 5741. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 22 × 74 = 1628. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 84 × 20 = 1680. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 978 + 578 = 1557. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 148 + 142 = 290. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 97 × 62 = 6021. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 98 × 32 = 3129. Correct or wrong? (a) wrong (b) correct

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