Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 430 · 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: 24 × 81 = 1951. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 345 + 276 = 621. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 96 × 88 = 8448. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 20 × 44 = 880. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 58 × 29 = 1682. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 89 × 29 = 2581. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 655 + 994 = 1656. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 710 + 645 = 1355. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 19 = 1426. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 19 × 54 = 1019. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 232 + 143 = 375. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 733 + 492 = 1223. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 37 = 1406. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 294 + 547 = 834. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 73 × 41 = 2993. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 41 × 84 = 3449. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 304 + 445 = 754. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 91 × 17 = 1549. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 44 × 51 = 2244. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 54 = 972. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 310 + 139 = 450. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 21 × 64 = 1341. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 64 × 75 = 4800. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 147 + 173 = 320. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 36 = 1620. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 492 + 574 = 1062. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 257 + 285 = 543. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 265 + 691 = 956. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 53 × 62 = 3288. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 67 × 94 = 6298. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 52 = 1300. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 913 + 699 = 1608. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 84 × 75 = 6302. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 36 = 612. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 31 × 57 = 1769. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 75 × 29 = 2175. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 595 + 365 = 960. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 36 = 3376. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 16 × 82 = 1314. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 656 + 351 = 1011. Correct or wrong? (a) wrong (b) correct

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