Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 864 · 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: 92 × 18 = 1662. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 518 + 597 = 1115. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 90 = 2790. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 93 × 97 = 9025. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 58 = 4640. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 615 + 965 = 1580. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 93 × 32 = 2979. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 153 + 435 = 588. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 31 × 91 = 2821. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 90 × 23 = 2070. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 88 × 26 = 2290. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 68 = 1022. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 26 × 75 = 1950. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 947 + 296 = 1243. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 69 × 19 = 1311. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 421 + 732 = 1160. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 460 + 851 = 1305. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 713 + 919 = 1635. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 46 × 39 = 1787. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 23 × 80 = 1840. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 362 + 402 = 763. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 142 + 696 = 837. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 21 × 40 = 845. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 623 + 210 = 833. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 48 × 53 = 2538. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 50 × 80 = 3993. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 67 × 47 = 3155. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 305 + 206 = 511. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 39 = 3354. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 85 × 57 = 4845. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 701 + 336 = 1037. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 71 × 33 = 2337. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 94 × 79 = 7426. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 305 + 291 = 596. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 36 × 56 = 2016. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 529 + 335 = 864. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 31 × 83 = 2573. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 17 × 97 = 1648. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 546 + 280 = 826. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 900 + 789 = 1681. Correct or wrong? (a) correct (b) wrong

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