Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 248 · 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: 47 × 60 = 2822. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 33 × 44 = 1450. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 56 × 65 = 3640. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 827 + 138 = 965. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 878 + 853 = 1731. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 368 + 813 = 1177. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 46 = 1556. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 97 × 60 = 5818. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 964 + 346 = 1310. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 802 + 967 = 1769. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 752 + 293 = 1045. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 60 = 4620. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 960 + 845 = 1808. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 24 × 18 = 431. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 643 + 150 = 801. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 22 × 92 = 2022. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 483 + 231 = 714. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 80 × 68 = 5440. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 828 + 246 = 1074. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 677 + 402 = 1072. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 31 × 28 = 875. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 552 + 545 = 1097. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 252 + 921 = 1171. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 98 × 45 = 4410. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 46 × 47 = 2154. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 761 + 901 = 1662. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 80 × 18 = 1442. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 180 + 214 = 394. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 62 × 96 = 5952. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 45 × 53 = 2385. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 44 × 90 = 3960. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 465 + 365 = 826. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 241 + 168 = 409. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 46 × 85 = 3908. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 949 + 477 = 1426. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 123 + 234 = 365. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 437 + 510 = 948. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 292 + 287 = 579. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 36 × 26 = 936. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 79 × 13 = 1027. Correct or wrong? (a) wrong (b) correct

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