Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 857 · 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: 472 + 705 = 1177. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 98 × 41 = 4018. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 79 × 85 = 6715. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 93 × 36 = 3348. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 37 = 1332. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 83 × 54 = 4482. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 53 × 36 = 1908. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 37 × 58 = 2146. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 591 + 798 = 1389. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 28 × 46 = 1288. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 68 = 3196. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 258 + 335 = 593. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 294 + 664 = 955. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 830 + 353 = 1177. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 97 × 99 = 9603. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 364 + 708 = 1080. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 67 × 17 = 1136. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 606 + 238 = 844. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 55 × 84 = 4620. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 385 + 708 = 1093. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 934 + 276 = 1210. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 304 + 671 = 975. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 93 × 42 = 3900. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 683 + 716 = 1401. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 32 × 35 = 1120. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 198 + 164 = 362. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 231 + 205 = 438. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 57 = 1596. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 13 = 741. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 24 = 672. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 678 + 991 = 1664. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 97 × 17 = 1657. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 989 + 997 = 1988. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 833 + 153 = 986. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 26 × 28 = 728. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 62 × 90 = 5580. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 36 × 81 = 2916. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 62 × 49 = 3038. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 615 + 903 = 1517. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 434 + 916 = 1351. Correct or wrong? (a) wrong (b) correct

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