Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 32 · 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: 326 + 367 = 693. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 13 × 16 = 208. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 668 + 247 = 915. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 77 = 1313. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 359 + 216 = 570. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 15 = 1343. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 199 + 545 = 747. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 298 + 771 = 1069. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 808 + 171 = 979. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 587 + 264 = 851. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 88 × 92 = 8096. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 80 × 99 = 7913. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 78 × 63 = 4914. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 648 + 827 = 1474. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 97 × 93 = 9021. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 95 = 2572. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 24 = 840. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 37 = 3626. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 95 × 15 = 1430. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 421 + 682 = 1107. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 447 + 534 = 981. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 247 + 283 = 530. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 679 + 382 = 1061. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 62 × 92 = 5710. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 370 + 903 = 1273. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 400 + 201 = 601. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 86 = 1634. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 751 + 485 = 1236. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 163 + 403 = 565. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 507 + 184 = 691. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 31 × 41 = 1271. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 12 = 847. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 228 + 662 = 898. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 669 + 152 = 821. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 46 = 4370. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 927 + 726 = 1651. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 85 × 23 = 1947. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 635 + 335 = 973. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 86 × 69 = 5934. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 55 = 2966. Correct or wrong? (a) wrong (b) correct

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