Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 373 · 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: 546 + 952 = 1498. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 20 × 28 = 560. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 34 × 77 = 2618. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 189 + 273 = 462. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 19 × 67 = 1265. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 583 + 763 = 1346. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 929 + 743 = 1672. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 310 + 350 = 660. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 695 + 613 = 1309. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 45 × 23 = 1028. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 20 × 75 = 1500. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 748 + 968 = 1716. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 26 × 17 = 439. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 17 × 29 = 492. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 34 × 32 = 1089. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 94 × 96 = 9019. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 529 + 241 = 772. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 488 + 200 = 688. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 77 × 36 = 2774. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 127 + 932 = 1065. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 33 × 29 = 952. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 44 × 57 = 2508. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 56 × 78 = 4368. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 33 × 97 = 3201. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 862 + 417 = 1279. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 757 + 128 = 885. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 21 = 1806. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 449 + 193 = 638. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 568 + 353 = 921. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 937 + 427 = 1364. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 15 × 33 = 495. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 70 × 37 = 2590. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 312 + 797 = 1109. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 187 + 409 = 596. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 696 + 969 = 1670. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 76 = 1444. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 24 × 51 = 1224. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 91 × 61 = 5550. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 993 + 353 = 1346. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 43 = 1548. Correct or wrong? (a) correct (b) wrong

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