Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 745 · 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: 42 × 90 = 3775. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 99 × 77 = 7623. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 344 + 446 = 792. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 293 + 180 = 474. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 41 = 861. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 54 = 2322. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 39 × 67 = 2613. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 25 × 89 = 2227. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 26 = 310. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 206 + 678 = 884. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 52 × 42 = 2186. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 927 + 304 = 1233. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 911 + 120 = 1035. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 44 × 45 = 1977. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 448 + 205 = 653. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 32 = 865. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 67 × 23 = 1547. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 34 × 59 = 2001. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 631 + 404 = 1035. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 325 + 682 = 999. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 87 × 23 = 2006. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 12 × 20 = 240. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 56 × 61 = 3416. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 786 + 523 = 1313. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 645 + 707 = 1352. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 425 + 761 = 1186. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 684 + 391 = 1075. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 27 × 16 = 432. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 37 = 2732. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 90 × 13 = 1170. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 47 × 27 = 1266. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 41 = 775. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 45 × 22 = 990. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 80 × 19 = 1525. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 881 + 359 = 1240. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 25 × 37 = 925. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 92 × 87 = 8004. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 98 × 90 = 8818. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 541 + 642 = 1183. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 794 + 438 = 1232. Correct or wrong? (a) wrong (b) correct

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