Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 386 · 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: 697 + 388 = 1092. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 229 + 321 = 554. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 725 + 392 = 1117. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 23 × 66 = 1518. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 45 × 56 = 2520. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 894 + 337 = 1233. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 162 + 945 = 1107. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 92 = 3863. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 23 = 351. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 528 + 408 = 929. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 598 + 359 = 957. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 23 × 79 = 1819. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 43 × 55 = 2365. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 14 × 19 = 266. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 71 × 92 = 6532. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 311 + 280 = 583. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 271 + 145 = 416. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 98 × 84 = 8232. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 77 × 73 = 5621. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 692 + 587 = 1279. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 92 × 14 = 1288. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 845 + 858 = 1697. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 824 + 295 = 1121. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 75 × 96 = 7202. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 91 × 41 = 3731. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 41 × 93 = 3808. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 89 × 21 = 1862. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 14 × 94 = 1312. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 896 + 857 = 1745. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 53 × 58 = 3074. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 44 × 94 = 4140. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 239 + 665 = 904. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 297 + 309 = 608. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 48 × 66 = 3168. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 338 + 253 = 598. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 269 + 273 = 534. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 16 × 50 = 798. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 966 + 491 = 1457. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 84 × 35 = 2940. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 910 + 275 = 1185. Correct or wrong? (a) correct (b) wrong

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