Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 927 · 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: 91 × 20 = 1821. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 17 × 12 = 200. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 59 × 69 = 4070. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 931 + 297 = 1233. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 32 × 16 = 511. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 54 × 36 = 1950. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 80 × 16 = 1279. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 12 × 97 = 1166. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 37 × 43 = 1591. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 197 + 707 = 904. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 913 + 213 = 1126. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 90 × 49 = 4410. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 95 × 87 = 8265. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 80 × 18 = 1447. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 830 + 208 = 1030. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 21 × 21 = 441. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 76 = 2576. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 12 × 77 = 927. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 14 = 828. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 35 × 57 = 1992. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 803 + 575 = 1386. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 900 + 831 = 1734. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 406 + 597 = 995. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 59 = 4427. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 90 × 98 = 8827. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 56 × 69 = 3870. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 71 × 68 = 4823. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 85 × 71 = 6038. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 13 = 962. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 46 × 26 = 1193. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 334 + 481 = 811. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 85 × 24 = 2046. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 33 × 35 = 1155. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 526 + 268 = 794. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 43 = 3354. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 496 + 148 = 640. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 396 + 811 = 1207. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 90 × 87 = 7830. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 61 × 67 = 4093. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 692 + 933 = 1625. Correct or wrong? (a) wrong (b) correct

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