Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 867 · 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: 74 × 76 = 5624. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 14 = 1246. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 75 = 1800. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 32 × 62 = 1976. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 49 × 21 = 1029. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 23 × 57 = 1312. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 333 + 678 = 1017. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 981 + 181 = 1166. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 165 + 316 = 481. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 515 + 199 = 714. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 94 × 21 = 1982. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 340 + 240 = 580. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 46 × 80 = 3680. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 24 × 30 = 720. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 277 + 346 = 623. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 234 + 678 = 912. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 396 + 687 = 1083. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 126 + 475 = 601. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 12 × 86 = 1032. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 699 + 310 = 1016. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 91 × 87 = 7913. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 338 + 603 = 945. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 91 × 78 = 7098. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 438 + 193 = 631. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 419 + 158 = 577. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 86 × 31 = 2666. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 877 + 402 = 1286. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 407 + 473 = 888. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 41 × 82 = 3368. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 696 + 453 = 1142. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 90 × 32 = 2880. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 659 + 849 = 1508. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 17 × 70 = 1190. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 96 × 99 = 9504. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 71 × 35 = 2485. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 332 + 230 = 554. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 872 + 213 = 1089. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 292 + 321 = 605. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 421 + 509 = 929. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 44 × 53 = 2332. Correct or wrong? (a) correct (b) wrong

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