Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 166 · 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: 52 × 39 = 2025. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 70 × 57 = 3990. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 223 + 346 = 562. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 42 × 35 = 1470. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 46 × 29 = 1340. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 24 × 67 = 1611. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 139 + 761 = 900. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 63 × 84 = 5292. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 615 + 462 = 1077. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 49 × 28 = 1372. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 961 + 459 = 1420. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 76 × 61 = 4636. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 13 × 48 = 632. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 41 × 62 = 2544. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 298 + 300 = 606. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 731 + 733 = 1464. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 82 × 43 = 3529. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 34 × 18 = 615. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 274 + 937 = 1211. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 44 × 59 = 2591. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 574 + 133 = 707. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 86 × 65 = 5590. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 95 × 94 = 8935. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 594 + 958 = 1550. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 552 + 756 = 1315. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 854 + 916 = 1774. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 56 × 77 = 4305. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 553 + 160 = 713. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 79 × 21 = 1659. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 98 × 43 = 4214. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 491 + 303 = 794. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 15 × 74 = 1110. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 51 × 22 = 1120. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 746 + 581 = 1327. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 400 + 443 = 843. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 17 = 197. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 136 + 203 = 339. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 34 × 75 = 2545. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 45 × 64 = 2888. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 28 × 83 = 2324. Correct or wrong? (a) correct (b) wrong

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