Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 990 · 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: 45 × 30 = 1355. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 58 × 77 = 4466. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 23 × 46 = 1061. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 737 + 386 = 1116. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 608 + 897 = 1500. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 279 + 525 = 812. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 800 + 440 = 1240. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 29 × 20 = 583. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 282 + 636 = 923. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 889 + 152 = 1041. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 821 + 877 = 1696. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 19 × 70 = 1327. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 60 × 87 = 5219. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 952 + 846 = 1798. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 193 + 574 = 767. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 18 = 594. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 32 × 96 = 3077. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 71 × 32 = 2272. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 712 + 386 = 1105. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 53 × 33 = 1750. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 25 × 96 = 2397. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 858 + 431 = 1293. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 319 + 415 = 740. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 237 + 838 = 1083. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 479 + 989 = 1470. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 37 × 71 = 2635. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 327 + 910 = 1237. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 606 + 719 = 1328. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 997 + 458 = 1455. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 495 + 808 = 1303. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 280 + 496 = 777. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 47 = 1605. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 850 + 482 = 1332. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 86 × 69 = 5934. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 988 + 616 = 1604. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 27 × 70 = 1882. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 628 + 187 = 822. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 97 × 58 = 5626. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 84 × 19 = 1596. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 660 + 259 = 926. Correct or wrong? (a) wrong (b) correct

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