Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 193 · 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: 59 × 26 = 1534. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 37 × 23 = 848. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 823 + 379 = 1202. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 487 + 955 = 1439. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 56 × 25 = 1403. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 826 + 160 = 992. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 543 + 853 = 1392. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 18 × 63 = 1134. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 28 × 64 = 1792. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 20 × 71 = 1421. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 78 × 92 = 7176. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 743 + 903 = 1646. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 66 × 52 = 3429. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 562 + 469 = 1031. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 19 = 432. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 54 × 54 = 2916. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 60 × 41 = 2460. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 85 × 95 = 8075. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 24 × 56 = 1344. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 28 × 76 = 2130. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 738 + 719 = 1460. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 408 + 382 = 790. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 90 × 97 = 8735. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 81 × 86 = 6966. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 14 × 52 = 728. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 91 × 56 = 5096. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 753 + 400 = 1153. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 61 × 41 = 2501. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 725 + 240 = 965. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 97 × 71 = 6888. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 356 + 764 = 1119. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 668 + 921 = 1597. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 88 × 31 = 2728. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 918 + 546 = 1464. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 75 × 37 = 2768. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 72 × 75 = 5400. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 478 + 835 = 1312. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 417 + 622 = 1039. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 74 × 82 = 6067. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 15 × 65 = 975. Correct or wrong? (a) wrong (b) correct

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