Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 203 · 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: 680 + 985 = 1665. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 13 = 924. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 26 × 35 = 910. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 57 × 93 = 5301. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 99 × 18 = 1787. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 68 × 27 = 1836. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 19 × 75 = 1420. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 839 + 280 = 1123. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 22 × 70 = 1547. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 26 × 40 = 1040. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 54 × 19 = 1025. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 716 + 280 = 1000. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 27 × 65 = 1762. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 96 × 31 = 2983. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 17 × 36 = 612. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 58 = 1798. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 64 × 61 = 3908. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 248 + 526 = 774. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 291 + 737 = 1028. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 72 × 90 = 6481. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 743 + 122 = 865. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 856 + 901 = 1759. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 305 + 877 = 1182. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 687 + 821 = 1508. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 83 × 26 = 2158. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 655 + 930 = 1585. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 902 + 347 = 1249. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 86 × 75 = 6450. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 859 + 491 = 1350. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 47 × 33 = 1551. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 47 × 18 = 846. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 26 = 969. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 577 + 724 = 1294. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 47 × 28 = 1315. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 510 + 143 = 653. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 487 + 216 = 695. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 47 × 71 = 3337. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 39 × 42 = 1638. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 624 + 540 = 1156. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 952 + 348 = 1300. Correct or wrong? (a) wrong (b) correct

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