Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 223 · 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 × 43 = 2537. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 874 + 745 = 1619. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 895 + 661 = 1556. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 78 × 58 = 4524. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 301 + 680 = 979. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 27 = 1674. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 424 + 345 = 769. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 73 = 5767. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 35 × 72 = 2520. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 67 × 55 = 3680. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 443 + 253 = 696. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 577 + 843 = 1426. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 601 + 536 = 1137. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 35 × 97 = 3395. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 71 × 16 = 1138. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 233 + 120 = 353. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 23 = 414. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 88 × 64 = 5633. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 440 + 149 = 589. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 26 × 64 = 1664. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 901 + 221 = 1129. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 51 × 62 = 3158. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 23 × 59 = 1362. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 80 × 71 = 5684. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 452 + 753 = 1208. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 27 × 17 = 459. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 70 × 68 = 4760. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 15 × 17 = 255. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 13 × 31 = 407. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 77 × 48 = 3696. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 15 × 69 = 1033. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 468 + 351 = 819. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 63 × 73 = 4596. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 621 + 181 = 809. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 48 = 723. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 187 + 549 = 736. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 233 + 371 = 604. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 289 + 281 = 570. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 880 + 877 = 1765. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 742 + 785 = 1527. Correct or wrong? (a) correct (b) wrong

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