Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 295 · 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: 58 × 42 = 2436. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 96 × 23 = 2209. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 81 × 12 = 968. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 75 × 73 = 5471. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 397 + 545 = 942. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 821 + 829 = 1646. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 14 × 72 = 1003. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 289 + 856 = 1138. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 937 + 246 = 1183. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 19 × 14 = 269. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 405 + 967 = 1364. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 718 + 451 = 1169. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 28 × 16 = 448. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 788 + 923 = 1717. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 33 × 17 = 556. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 21 = 693. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 85 = 4763. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 285 + 332 = 625. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 21 × 97 = 2035. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 63 × 52 = 3276. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 47 × 34 = 1593. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 30 × 59 = 1770. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 522 + 779 = 1303. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 786 + 200 = 994. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 980 + 361 = 1341. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 69 × 66 = 4554. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 379 + 197 = 576. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 69 × 73 = 5037. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 666 + 874 = 1544. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 23 × 20 = 460. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 537 + 976 = 1513. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 28 = 2544. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 735 + 463 = 1199. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 226 + 269 = 495. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 12 × 61 = 734. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 120 + 200 = 322. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 92 × 70 = 6438. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 43 × 27 = 1169. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 39 × 31 = 1202. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 44 = 1583. Correct or wrong? (a) wrong (b) correct

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