Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 270 · 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: 16 × 56 = 896. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 421 + 194 = 619. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 265 + 958 = 1223. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 72 × 93 = 6704. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 798 + 231 = 1023. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 29 × 73 = 2117. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 22 × 61 = 1342. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 86 × 17 = 1458. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 55 × 76 = 4180. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 329 + 477 = 805. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 76 × 76 = 5776. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 65 × 27 = 1755. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 51 = 4080. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 92 × 28 = 2581. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 376 + 571 = 947. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 461 + 898 = 1363. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 192 + 347 = 533. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 557 + 336 = 893. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 18 × 32 = 576. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 385 + 392 = 769. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 166 + 223 = 389. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 554 + 505 = 1059. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 64 × 33 = 2112. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 216 + 526 = 741. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 52 = 780. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 81 × 73 = 5909. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 652 + 326 = 983. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 46 × 53 = 2433. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 132 + 209 = 341. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 21 = 1263. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 14 × 47 = 653. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 28 × 95 = 2660. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 679 + 554 = 1237. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 860 + 222 = 1082. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 64 = 2176. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 17 × 21 = 350. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 936 + 234 = 1170. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 274 + 805 = 1084. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 37 = 1221. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 94 × 73 = 6859. Correct or wrong? (a) wrong (b) correct

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