Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 349 · 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: 18 × 29 = 522. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 229 + 349 = 575. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 44 × 65 = 2860. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 42 × 74 = 3107. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 79 × 94 = 7426. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 39 = 507. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 71 × 61 = 4327. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 950 + 181 = 1131. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 33 × 74 = 2442. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 89 × 37 = 3293. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 778 + 707 = 1483. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 61 × 54 = 3294. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 89 = 2581. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 934 + 607 = 1548. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 32 = 1509. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 729 + 891 = 1620. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 65 × 15 = 975. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 47 × 99 = 4653. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 65 × 97 = 6310. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 16 × 43 = 688. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 934 + 793 = 1721. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 913 + 307 = 1220. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 72 × 14 = 1006. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 18 × 91 = 1638. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 22 × 24 = 536. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 17 × 61 = 1037. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 32 × 58 = 1860. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 38 × 39 = 1482. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 87 × 64 = 5568. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 347 + 828 = 1175. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 765 + 465 = 1230. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 32 × 52 = 1664. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 83 × 64 = 5312. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 677 + 246 = 923. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 96 × 74 = 7104. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 67 × 59 = 3958. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 169 + 456 = 625. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 901 + 807 = 1708. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 431 + 842 = 1273. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 511 + 532 = 1043. Correct or wrong? (a) wrong (b) correct

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