Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 22 · 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: 60 × 77 = 4612. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 493 + 528 = 1021. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 68 × 17 = 1156. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 57 × 29 = 1653. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 624 + 952 = 1576. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 873 + 794 = 1667. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 211 + 577 = 791. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 820 + 703 = 1523. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 87 × 15 = 1297. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 92 × 84 = 7733. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 94 × 14 = 1312. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 40 × 52 = 2080. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 74 × 36 = 2658. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 915 + 774 = 1692. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 62 × 41 = 2542. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 610 + 685 = 1295. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 225 + 497 = 722. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 941 + 663 = 1604. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 99 × 61 = 6046. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 43 × 28 = 1207. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 43 × 70 = 3010. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 77 × 43 = 3311. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 124 + 453 = 577. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 53 = 1119. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 229 + 122 = 350. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 188 + 351 = 539. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 967 + 222 = 1189. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 97 × 93 = 9021. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 39 × 79 = 3084. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 51 × 51 = 2601. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 288 + 741 = 1029. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 75 × 48 = 3600. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 736 + 213 = 949. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 715 + 143 = 858. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 59 × 34 = 2009. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 182 + 932 = 1121. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 379 + 464 = 843. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 51 = 1832. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 418 + 229 = 647. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 967 + 464 = 1431. Correct or wrong? (a) wrong (b) correct

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