Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 899 · 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: 194 + 819 = 1013. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 67 × 61 = 4087. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 160 + 734 = 887. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 30 × 43 = 1297. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 95 × 40 = 3794. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 761 + 940 = 1698. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 46 × 87 = 4007. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 316 + 737 = 1045. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 931 + 711 = 1650. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 935 + 622 = 1565. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 24 = 1123. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 48 × 82 = 3932. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 580 + 182 = 762. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 255 + 320 = 573. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 46 × 68 = 3132. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 442 + 124 = 565. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 31 = 900. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 362 + 829 = 1191. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 40 × 58 = 2320. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 94 × 65 = 6118. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 50 × 13 = 652. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 375 + 975 = 1351. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 217 + 588 = 810. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 317 + 155 = 472. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 92 × 31 = 2852. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 573 + 180 = 753. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 998 + 414 = 1412. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 489 + 951 = 1440. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 36 × 39 = 1398. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 27 × 63 = 1701. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 656 + 146 = 803. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 53 = 2438. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 16 × 39 = 626. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 72 × 25 = 1799. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 733 + 868 = 1596. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 77 × 14 = 1078. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 838 + 654 = 1492. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 22 × 32 = 704. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 889 + 256 = 1146. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 31 × 91 = 2815. Correct or wrong? (a) correct (b) wrong

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