Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 354 · 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: 994 + 850 = 1844. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 83 = 8134. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 481 + 583 = 1064. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 62 × 86 = 5329. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 957 + 775 = 1732. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 69 × 75 = 5175. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 77 × 39 = 3005. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 587 + 835 = 1422. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 33 = 2475. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 67 = 3484. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 13 × 76 = 991. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 43 × 81 = 3483. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 90 × 77 = 6930. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 826 + 482 = 1300. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 36 × 25 = 901. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 56 × 40 = 2240. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 41 × 70 = 2870. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 950 + 605 = 1555. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 881 + 307 = 1188. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 660 + 283 = 943. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 911 + 720 = 1630. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 961 + 141 = 1102. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 97 × 79 = 7663. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 982 + 737 = 1714. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 813 + 683 = 1502. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 42 × 55 = 2311. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 86 × 22 = 1888. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 78 × 97 = 7569. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 56 × 28 = 1565. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 276 + 229 = 505. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 769 + 628 = 1396. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 649 + 732 = 1381. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 50 × 31 = 1550. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 557 + 447 = 1004. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 59 × 22 = 1291. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 27 = 351. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 210 + 933 = 1143. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 841 + 649 = 1497. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 31 × 73 = 2263. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 46 × 49 = 2253. Correct or wrong? (a) wrong (b) correct

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