Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 181 · 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: 530 + 471 = 1008. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 199 + 648 = 847. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 83 × 28 = 2324. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 307 + 942 = 1249. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 16 × 89 = 1424. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 30 × 46 = 1380. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 87 × 18 = 1566. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 741 + 223 = 964. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 306 + 839 = 1141. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 511 + 274 = 785. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 68 = 1434. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 54 × 17 = 918. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 46 = 3680. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 807 + 495 = 1308. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 59 × 15 = 879. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 950 + 898 = 1846. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 20 × 75 = 1500. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 28 × 70 = 1962. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 178 + 804 = 982. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 147 + 615 = 762. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 37 × 24 = 888. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 38 × 13 = 491. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 736 + 473 = 1209. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 53 × 52 = 2756. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 64 × 27 = 1722. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 80 × 30 = 2397. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 99 × 76 = 7530. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 580 + 311 = 891. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 760 + 263 = 1023. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 523 + 505 = 1028. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 84 × 75 = 6306. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 47 = 1733. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 656 + 973 = 1629. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 899 + 481 = 1378. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 86 × 70 = 6026. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 43 × 66 = 2836. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 576 + 302 = 875. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 33 = 866. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 776 + 373 = 1149. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 941 + 326 = 1267. Correct or wrong? (a) correct (b) wrong

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