Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 246 · 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: 55 × 38 = 2090. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 326 + 734 = 1061. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 62 × 87 = 5394. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 68 × 76 = 5168. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 249 + 411 = 660. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 195 + 295 = 490. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 44 = 748. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 246 + 979 = 1230. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 368 + 395 = 765. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 723 + 685 = 1408. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 797 + 378 = 1175. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 178 + 607 = 780. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 667 + 238 = 905. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 58 × 59 = 3422. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 69 = 2208. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 147 + 391 = 540. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 434 + 310 = 746. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 757 + 142 = 899. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 88 × 32 = 2817. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 853 + 491 = 1344. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 19 × 56 = 1064. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 20 = 732. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 28 × 21 = 590. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 545 + 862 = 1414. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 522 + 289 = 811. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 80 × 65 = 5197. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 212 + 141 = 353. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 99 × 75 = 7425. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 515 + 861 = 1376. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 22 × 34 = 754. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 77 × 67 = 5159. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 16 × 68 = 1088. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 585 + 210 = 795. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 25 × 96 = 2400. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 730 + 212 = 942. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 70 = 6510. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 62 × 12 = 747. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 78 × 88 = 6866. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 538 + 679 = 1214. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 269 + 338 = 607. Correct or wrong? (a) wrong (b) correct

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