Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 594 · 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: 92 × 66 = 6072. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 954 + 621 = 1575. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 90 × 18 = 1620. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 541 + 225 = 774. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 554 + 970 = 1521. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 53 × 58 = 3073. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 85 × 30 = 2542. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 31 × 29 = 892. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 857 + 282 = 1139. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 137 + 716 = 846. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 67 × 56 = 3753. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 123 + 696 = 819. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 525 + 551 = 1076. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 458 + 808 = 1266. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 12 × 14 = 176. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 291 + 843 = 1134. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 149 + 739 = 886. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 53 × 21 = 1118. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 293 + 321 = 614. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 65 × 17 = 1105. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 953 + 483 = 1436. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 816 + 780 = 1588. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 71 × 94 = 6674. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 46 × 60 = 2762. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 52 × 37 = 1925. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 83 × 34 = 2822. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 66 × 22 = 1452. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 672 + 454 = 1126. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 612 + 123 = 733. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 77 × 69 = 5313. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 896 + 603 = 1499. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 42 × 63 = 2646. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 997 + 524 = 1527. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 89 × 48 = 4278. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 72 × 63 = 4538. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 854 + 751 = 1601. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 98 × 48 = 4704. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 177 + 797 = 966. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 826 + 140 = 966. Correct or wrong? (a) wrong (b) correct

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