Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 33 · 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: 88 × 44 = 3872. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 40 × 43 = 1720. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 40 × 22 = 880. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 565 + 407 = 972. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 781 + 329 = 1110. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 40 × 41 = 1640. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 23 × 31 = 708. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 92 × 47 = 4327. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 832 + 619 = 1452. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 774 + 479 = 1253. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 14 × 32 = 448. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 52 × 56 = 2912. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 42 = 2772. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 207 + 160 = 364. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 135 + 312 = 447. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 391 + 743 = 1135. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 253 + 234 = 487. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 637 + 463 = 1100. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 45 × 63 = 2833. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 869 + 775 = 1644. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 61 × 42 = 2562. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 91 × 51 = 4639. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 338 + 228 = 564. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 963 + 529 = 1492. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 85 × 33 = 2805. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 25 × 42 = 1056. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 807 + 890 = 1693. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 864 + 630 = 1494. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 574 + 586 = 1156. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 32 × 17 = 544. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 39 × 51 = 1981. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 766 + 592 = 1366. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 531 + 414 = 945. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 98 × 72 = 7056. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 678 + 231 = 909. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 78 = 1475. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 49 × 77 = 3773. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 988 + 484 = 1474. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 31 × 20 = 618. Correct or wrong? (a) correct (b) wrong

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