Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 665 · 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: 45 × 12 = 540. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 289 + 753 = 1046. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 82 = 2050. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 75 = 1128. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 19 = 1273. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 963 + 592 = 1555. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 12 × 38 = 456. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 32 × 39 = 1240. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 64 × 28 = 1792. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 70 × 79 = 5528. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 21 = 482. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 692 + 735 = 1434. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 51 × 54 = 2754. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 36 × 46 = 1656. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 23 × 36 = 828. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 38 = 1028. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 37 × 41 = 1519. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 786 + 358 = 1144. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 503 + 130 = 635. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 563 + 583 = 1146. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 222 + 220 = 442. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 154 + 281 = 435. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 80 × 71 = 5680. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 86 × 23 = 1978. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 368 + 958 = 1326. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 87 × 91 = 7924. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 467 + 199 = 666. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 151 + 476 = 627. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 39 × 31 = 1203. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 150 + 874 = 1024. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 16 × 27 = 425. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 978 + 223 = 1201. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 478 + 371 = 852. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 391 + 458 = 854. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 22 × 41 = 894. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 96 × 61 = 5856. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 387 + 563 = 948. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 943 + 688 = 1631. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 240 + 829 = 1069. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 336 + 234 = 570. Correct or wrong? (a) correct (b) wrong

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