Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 550 · 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: 526 + 758 = 1290. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 765 + 394 = 1158. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 721 + 319 = 1036. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 373 + 804 = 1179. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 45 × 65 = 2925. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 15 × 72 = 1086. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 27 = 805. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 596 + 558 = 1155. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 65 × 22 = 1430. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 27 × 70 = 1890. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 734 + 934 = 1667. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 636 + 694 = 1323. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 679 + 243 = 915. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 31 × 34 = 1054. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 697 + 710 = 1414. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 30 × 59 = 1766. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 89 × 51 = 4539. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 48 × 26 = 1248. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 944 + 152 = 1099. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 37 × 71 = 2627. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 26 × 65 = 1690. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 65 × 53 = 3445. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 384 + 750 = 1134. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 39 × 29 = 1123. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 14 × 41 = 574. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 792 + 513 = 1305. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 88 × 28 = 2464. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 785 + 675 = 1467. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 941 + 632 = 1573. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 56 × 57 = 3184. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 70 × 22 = 1545. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 859 + 760 = 1619. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 12 × 91 = 1092. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 27 × 61 = 1645. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 28 × 86 = 2401. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 128 + 466 = 600. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 915 + 401 = 1314. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 868 + 848 = 1724. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 18 × 90 = 1616. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 22 × 34 = 755. Correct or wrong? (a) correct (b) wrong

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