Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 723 · 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: 218 + 144 = 362. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 817 + 684 = 1501. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 949 + 339 = 1280. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 592 + 175 = 767. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 57 × 74 = 4218. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 91 = 8008. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 41 = 3977. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 821 + 624 = 1439. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 49 × 90 = 4406. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 829 + 150 = 979. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 310 + 183 = 500. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 620 + 945 = 1565. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 48 × 99 = 4752. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 259 + 549 = 810. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 67 × 81 = 5424. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 78 × 18 = 1403. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 98 × 18 = 1764. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 805 + 143 = 948. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 805 + 711 = 1516. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 42 × 81 = 3402. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 806 + 695 = 1501. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 66 × 38 = 2508. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 467 + 469 = 944. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 40 × 78 = 3118. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 44 × 19 = 834. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 75 = 3600. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 688 + 226 = 908. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 126 + 858 = 984. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 883 + 200 = 1083. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 57 × 89 = 5068. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 57 × 34 = 1944. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 488 + 585 = 1078. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 391 + 952 = 1346. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 72 × 81 = 5835. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 38 × 25 = 958. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 817 + 485 = 1310. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 35 × 48 = 1687. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 202 + 303 = 504. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 59 × 58 = 3429. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 98 × 27 = 2646. Correct or wrong? (a) correct (b) wrong

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