Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 664 · 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: 69 × 82 = 5658. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 95 = 1520. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 99 × 41 = 4059. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 223 + 403 = 625. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 33 × 73 = 2401. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 96 × 19 = 1824. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 293 + 172 = 465. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 78 × 13 = 1014. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 390 + 576 = 972. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 24 = 1296. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 17 × 98 = 1666. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 70 × 65 = 4547. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 42 × 83 = 3486. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 34 × 20 = 672. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 32 × 41 = 1304. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 189 + 659 = 848. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 33 × 38 = 1254. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 292 + 858 = 1150. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 54 × 64 = 3449. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 53 × 73 = 3869. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 451 + 962 = 1413. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 189 + 311 = 506. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 69 × 40 = 2761. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 473 + 901 = 1374. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 35 × 80 = 2805. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 138 + 428 = 563. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 743 + 505 = 1248. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 75 = 2100. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 171 + 672 = 838. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 797 + 353 = 1151. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 20 = 400. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 732 + 232 = 956. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 79 × 29 = 2291. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 52 = 4311. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 94 × 27 = 2538. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 15 × 53 = 795. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 48 × 64 = 3074. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 962 + 283 = 1248. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 36 × 26 = 936. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 78 × 37 = 2886. Correct or wrong? (a) wrong (b) correct

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