Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 902 · 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: 71 × 54 = 3834. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 154 + 513 = 675. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 57 × 85 = 4845. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 46 × 30 = 1387. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 469 + 644 = 1108. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 572 + 132 = 704. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 53 × 26 = 1378. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 528 + 393 = 921. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 181 + 764 = 948. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 615 + 252 = 874. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 13 × 34 = 442. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 64 × 23 = 1476. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 242 + 227 = 474. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 70 = 2590. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 96 × 24 = 2305. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 197 + 663 = 860. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 74 × 96 = 7099. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 153 + 938 = 1091. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 171 + 330 = 504. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 506 + 787 = 1288. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 402 + 432 = 834. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 15 × 86 = 1290. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 51 × 40 = 2040. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 93 × 66 = 6138. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 213 + 192 = 409. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 66 × 13 = 858. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 141 + 306 = 447. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 76 × 29 = 2198. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 27 × 12 = 318. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 45 × 14 = 630. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 793 + 589 = 1382. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 673 + 945 = 1618. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 68 × 63 = 4284. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 442 + 331 = 773. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 308 + 447 = 755. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 57 × 49 = 2793. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 74 × 16 = 1185. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 358 + 250 = 608. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 370 + 494 = 864. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 39 × 12 = 461. Correct or wrong? (a) wrong (b) correct

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