Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 876 · 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: 23 × 85 = 1955. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 39 × 18 = 700. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 53 × 78 = 4135. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 84 × 76 = 6384. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 338 + 447 = 781. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 295 + 835 = 1128. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 16 × 41 = 663. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 64 × 26 = 1663. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 56 × 59 = 3304. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 14 = 826. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 998 + 156 = 1152. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 22 × 57 = 1254. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 615 + 594 = 1209. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 966 + 918 = 1884. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 802 + 759 = 1554. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 453 + 454 = 909. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 25 × 71 = 1772. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 93 × 96 = 8928. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 785 + 730 = 1515. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 21 × 79 = 1655. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 303 + 184 = 489. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 48 × 16 = 765. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 48 × 71 = 3407. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 359 + 323 = 682. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 838 + 615 = 1452. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 38 × 61 = 2318. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 29 × 63 = 1828. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 23 × 75 = 1725. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 216 + 425 = 641. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 879 + 620 = 1499. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 841 + 531 = 1370. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 86 = 3694. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 177 + 454 = 625. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 626 + 869 = 1497. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 235 + 321 = 556. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 21 × 78 = 1633. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 951 + 626 = 1577. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 67 × 96 = 6437. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 645 + 573 = 1218. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 37 × 17 = 629. Correct or wrong? (a) wrong (b) correct

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