Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 391 · 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: 328 + 479 = 807. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 52 × 39 = 2028. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 49 × 46 = 2254. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 566 + 186 = 752. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 33 × 36 = 1192. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 888 + 734 = 1615. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 78 × 92 = 7174. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 897 + 601 = 1502. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 943 + 277 = 1220. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 65 × 63 = 4090. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 252 + 498 = 750. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 585 + 605 = 1191. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 318 + 136 = 454. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 180 + 842 = 1028. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 90 × 96 = 8636. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 370 + 326 = 697. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 44 × 39 = 1716. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 79 × 12 = 948. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 30 × 72 = 2158. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 975 + 296 = 1271. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 12 × 41 = 492. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 18 × 17 = 302. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 52 × 30 = 1560. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 229 + 584 = 811. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 664 + 521 = 1179. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 62 × 42 = 2604. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 13 × 46 = 604. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 318 + 681 = 992. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 90 × 70 = 6300. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 74 = 2149. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 34 × 15 = 510. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 968 + 974 = 1942. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 367 + 309 = 678. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 59 × 58 = 3422. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 48 × 80 = 3840. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 940 + 483 = 1423. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 849 + 606 = 1455. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 817 + 799 = 1616. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 156 + 425 = 581. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 148 + 903 = 1046. Correct or wrong? (a) correct (b) wrong

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