Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 74 · 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: 34 × 81 = 2754. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 706 + 476 = 1182. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 362 + 174 = 531. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 36 = 540. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 30 × 92 = 2765. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 17 × 19 = 323. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 33 × 86 = 2839. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 21 × 14 = 295. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 83 × 93 = 7724. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 92 × 96 = 8838. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 309 + 124 = 433. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 616 + 428 = 1044. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 859 + 485 = 1343. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 431 + 835 = 1264. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 138 + 342 = 480. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 610 + 213 = 823. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 85 × 34 = 2888. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 61 × 18 = 1091. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 177 + 634 = 811. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 47 × 16 = 753. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 678 + 974 = 1658. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 291 + 596 = 887. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 12 = 588. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 543 + 161 = 712. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 313 + 530 = 840. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 135 + 178 = 313. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 63 × 15 = 939. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 517 + 507 = 1025. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 42 × 14 = 591. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 633 + 862 = 1503. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 81 × 37 = 2989. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 96 × 65 = 6245. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 897 + 561 = 1458. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 410 + 329 = 733. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 18 × 83 = 1494. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 866 + 213 = 1079. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 402 + 602 = 997. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 52 × 12 = 624. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 624 + 252 = 882. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 628 + 589 = 1217. Correct or wrong? (a) correct (b) wrong

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