Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 943 · 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: 80 × 72 = 5768. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 964 + 134 = 1098. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 84 × 14 = 1176. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 48 × 39 = 1877. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 667 + 215 = 882. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 72 = 2448. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 774 + 545 = 1325. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 155 + 224 = 377. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 65 × 54 = 3510. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 92 × 92 = 8464. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 899 + 374 = 1273. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 13 × 68 = 890. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 159 + 903 = 1062. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 36 × 84 = 3024. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 900 + 870 = 1773. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 188 + 916 = 1097. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 302 + 336 = 641. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 203 + 686 = 897. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 65 × 75 = 4875. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 524 + 354 = 884. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 52 × 33 = 1716. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 678 + 875 = 1548. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 467 + 973 = 1440. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 138 + 308 = 448. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 887 + 194 = 1081. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 638 + 150 = 787. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 21 × 15 = 315. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 471 + 212 = 683. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 91 = 1547. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 966 + 383 = 1349. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 959 + 385 = 1349. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 97 × 74 = 7178. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 43 × 17 = 731. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 75 × 58 = 4355. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 468 + 375 = 843. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 476 + 154 = 630. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 859 + 813 = 1672. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 89 × 32 = 2852. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 93 = 2703. Correct or wrong? (a) wrong (b) correct

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