Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 629 · 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: 935 + 838 = 1770. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 973 + 151 = 1124. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 91 = 2912. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 52 × 85 = 4426. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 33 × 47 = 1550. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 99 × 26 = 2580. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 620 + 272 = 888. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 822 + 539 = 1361. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 74 × 34 = 2524. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 49 = 1862. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 342 + 771 = 1113. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 27 × 55 = 1481. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 274 + 663 = 937. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 633 + 527 = 1156. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 44 = 2068. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 169 + 469 = 638. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 31 × 65 = 2008. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 59 × 68 = 4012. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 87 × 70 = 6090. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 23 × 83 = 1914. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 27 = 1863. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 31 × 69 = 2139. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 88 × 75 = 6592. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 448 + 754 = 1202. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 48 × 35 = 1676. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 56 × 59 = 3306. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 405 + 762 = 1167. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 154 + 447 = 594. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 627 + 968 = 1595. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 355 + 901 = 1251. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 383 + 801 = 1179. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 786 + 880 = 1666. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 82 × 79 = 6479. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 778 + 986 = 1764. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 140 + 321 = 454. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 37 = 887. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 74 × 55 = 4070. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 25 × 83 = 2074. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 865 + 213 = 1078. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 385 + 170 = 556. Correct or wrong? (a) correct (b) wrong

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