Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 841 · 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: 89 × 88 = 7832. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 859 + 632 = 1491. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 90 × 29 = 2617. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 647 + 227 = 882. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 174 + 760 = 934. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 177 + 631 = 809. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 73 × 59 = 4307. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 17 = 1437. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 44 × 50 = 2200. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 338 + 131 = 469. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 620 + 312 = 940. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 754 + 752 = 1511. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 809 + 344 = 1155. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 391 + 179 = 575. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 59 × 67 = 3953. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 151 + 670 = 818. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 60 × 24 = 1440. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 43 = 602. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 95 × 28 = 2668. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 701 + 682 = 1383. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 30 × 32 = 960. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 90 × 15 = 1350. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 45 × 58 = 2610. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 996 + 730 = 1726. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 590 + 833 = 1423. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 57 × 90 = 5130. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 198 + 617 = 815. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 86 × 39 = 3355. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 30 = 2227. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 683 + 179 = 863. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 99 × 32 = 3175. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 707 + 347 = 1054. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 765 + 439 = 1212. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 361 + 152 = 514. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 807 + 411 = 1221. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 385 + 279 = 666. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 89 × 34 = 3025. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 471 + 346 = 817. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 36 = 2484. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 37 × 45 = 1669. Correct or wrong? (a) wrong (b) correct

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