Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 97 · 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: 97 × 93 = 9022. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 47 × 86 = 4042. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 278 + 673 = 943. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 742 + 717 = 1459. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 812 + 134 = 946. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 44 × 63 = 2772. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 61 × 40 = 2440. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 62 × 77 = 4766. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 48 = 955. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 75 × 23 = 1727. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 358 + 922 = 1280. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 51 × 31 = 1573. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 83 × 93 = 7719. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 60 × 26 = 1555. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 98 = 9116. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 87 = 1133. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 301 + 612 = 913. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 756 + 155 = 911. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 25 × 59 = 1478. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 403 + 195 = 591. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 75 × 36 = 2700. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 537 + 373 = 910. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 758 + 668 = 1426. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 81 × 20 = 1620. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 293 + 586 = 887. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 21 × 29 = 609. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 76 × 83 = 6308. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 775 + 688 = 1457. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 53 × 95 = 5035. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 72 × 14 = 1013. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 422 + 553 = 975. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 584 + 557 = 1133. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 810 + 696 = 1505. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 17 × 74 = 1252. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 62 × 39 = 2419. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 71 × 24 = 1707. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 64 = 1144. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 147 + 140 = 287. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 34 = 2448. Correct or wrong? (a) wrong (b) correct

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