Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 523 · 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: 58 × 65 = 3774. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 614 + 865 = 1475. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 146 + 400 = 547. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 81 × 24 = 1940. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 219 + 977 = 1196. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 20 × 88 = 1768. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 15 = 450. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 13 × 69 = 897. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 72 × 51 = 3672. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 48 × 98 = 4704. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 85 = 4675. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 49 × 76 = 3721. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 14 × 80 = 1125. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 783 + 453 = 1237. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 52 × 79 = 4100. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 30 × 34 = 1021. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 78 × 26 = 2022. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 964 + 377 = 1341. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 244 + 304 = 548. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 93 × 25 = 2319. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 26 × 15 = 390. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 51 × 76 = 3884. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 729 + 298 = 1027. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 500 + 249 = 749. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 166 + 205 = 379. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 40 × 25 = 999. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 859 + 271 = 1130. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 17 × 12 = 212. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 29 × 72 = 2083. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 37 × 42 = 1548. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 877 + 161 = 1038. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 764 + 335 = 1094. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 385 + 722 = 1107. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 434 + 526 = 968. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 34 × 37 = 1251. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 39 × 72 = 2808. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 91 = 1638. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 317 + 586 = 903. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 99 × 51 = 5049. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 71 × 27 = 1917. Correct or wrong? (a) correct (b) wrong

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