Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 94 · 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: 717 + 706 = 1423. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 61 × 84 = 5124. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 54 × 23 = 1242. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 59 × 73 = 4308. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 122 + 483 = 603. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 95 × 21 = 1997. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 186 + 437 = 623. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 30 × 30 = 893. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 224 + 311 = 543. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 91 × 38 = 3451. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 38 × 27 = 1026. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 275 + 182 = 457. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 78 × 40 = 3117. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 291 + 294 = 585. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 67 × 29 = 1943. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 459 + 370 = 829. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 731 + 655 = 1386. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 457 + 280 = 731. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 654 + 846 = 1500. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 38 × 42 = 1598. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 90 × 68 = 6120. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 73 × 82 = 5986. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 124 + 281 = 411. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 211 + 447 = 657. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 71 × 17 = 1204. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 231 + 819 = 1054. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 85 = 1608. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 95 = 1331. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 15 × 57 = 855. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 956 + 357 = 1310. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 14 × 92 = 1293. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 28 × 28 = 784. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 248 + 788 = 1036. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 644 + 224 = 868. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 77 × 52 = 4005. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 378 + 692 = 1065. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 35 × 51 = 1785. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 177 + 675 = 852. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 478 + 962 = 1439. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 24 × 62 = 1489. Correct or wrong? (a) correct (b) wrong

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