Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 677 · 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: 724 + 859 = 1583. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 59 × 27 = 1601. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 62 × 21 = 1307. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 621 + 998 = 1617. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 88 × 32 = 2815. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 817 + 339 = 1156. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 50 × 93 = 4650. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 67 × 15 = 1006. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 79 × 30 = 2370. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 19 × 21 = 402. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 59 × 83 = 4897. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 309 + 215 = 524. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 54 × 22 = 1191. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 860 + 222 = 1089. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 73 × 26 = 1894. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 22 × 57 = 1255. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 14 = 1372. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 28 × 48 = 1344. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 569 + 824 = 1396. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 667 + 201 = 868. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 63 × 96 = 6048. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 33 × 92 = 3043. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 28 × 72 = 2021. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 71 × 52 = 3699. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 44 × 47 = 2068. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 22 × 70 = 1540. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 25 × 99 = 2479. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 186 + 187 = 374. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 263 + 223 = 486. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 81 × 21 = 1701. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 85 × 24 = 2045. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 34 × 90 = 3052. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 196 + 541 = 742. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 30 × 29 = 870. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 465 + 200 = 665. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 46 × 97 = 4462. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 168 + 836 = 1010. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 27 × 29 = 783. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 37 = 1225. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 408 + 251 = 663. Correct or wrong? (a) correct (b) wrong

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