Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 924 · 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: 268 + 994 = 1262. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 49 × 23 = 1128. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 14 × 24 = 334. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 994 + 254 = 1248. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 85 × 77 = 6545. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 30 × 49 = 1470. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 768 + 893 = 1656. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 772 + 221 = 993. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 540 + 171 = 713. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 31 × 61 = 1885. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 84 × 74 = 6216. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 646 + 342 = 988. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 86 × 90 = 7732. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 872 + 517 = 1392. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 535 + 545 = 1082. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 63 × 66 = 4158. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 77 × 71 = 5473. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 511 + 368 = 875. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 829 + 734 = 1559. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 81 × 32 = 2598. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 56 × 28 = 1565. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 692 + 449 = 1141. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 438 + 401 = 842. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 79 × 33 = 2602. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 27 = 405. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 488 + 350 = 839. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 20 × 85 = 1700. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 86 × 50 = 4300. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 51 × 98 = 4998. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 75 × 62 = 4650. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 488 + 950 = 1437. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 248 + 316 = 559. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 91 × 68 = 6188. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 86 × 38 = 3268. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 240 + 382 = 622. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 58 × 54 = 3132. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 943 + 227 = 1170. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 881 + 496 = 1384. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 82 × 81 = 6642. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 68 × 36 = 2441. Correct or wrong? (a) wrong (b) correct

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