Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 816 · 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: 86 × 44 = 3788. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 763 + 131 = 897. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 48 × 20 = 960. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 144 + 768 = 917. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 86 = 1810. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 73 × 71 = 5183. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 554 + 520 = 1074. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 267 + 392 = 662. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 66 × 98 = 6463. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 52 × 91 = 4732. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 93 × 56 = 5216. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 81 = 5913. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 18 = 288. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 91 × 88 = 8008. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 66 × 44 = 2904. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 286 + 432 = 718. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 182 + 475 = 657. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 573 + 634 = 1201. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 859 + 570 = 1436. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 601 + 781 = 1380. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 38 × 87 = 3306. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 18 × 88 = 1584. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 96 = 3644. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 86 × 61 = 5254. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 884 + 421 = 1305. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 359 + 941 = 1300. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 22 × 42 = 924. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 244 + 182 = 433. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 583 + 829 = 1416. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 288 + 657 = 945. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 910 + 279 = 1194. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 36 = 1625. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 727 + 283 = 1011. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 56 × 64 = 3590. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 87 × 67 = 5834. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 66 × 91 = 6011. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 50 × 68 = 3400. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 804 + 322 = 1130. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 82 × 23 = 1891. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 558 + 223 = 783. Correct or wrong? (a) correct (b) wrong

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