Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 860 · 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: 23 × 25 = 578. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 63 × 29 = 1827. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 73 × 44 = 3213. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 38 × 60 = 2285. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 513 + 232 = 745. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 19 × 98 = 1862. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 36 × 38 = 1368. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 259 + 214 = 473. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 73 × 51 = 3719. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 811 + 162 = 973. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 56 × 75 = 4200. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 24 × 17 = 403. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 28 × 60 = 1687. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 71 × 26 = 1843. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 91 × 79 = 7181. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 335 + 756 = 1084. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 394 + 244 = 635. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 66 = 6469. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 788 + 168 = 956. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 31 × 51 = 1581. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 29 × 34 = 988. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 79 × 23 = 1822. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 466 + 969 = 1428. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 64 × 18 = 1152. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 30 × 97 = 2910. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 249 + 687 = 936. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 84 = 2441. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 12 × 36 = 432. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 180 + 216 = 389. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 641 + 994 = 1642. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 786 + 132 = 926. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 240 + 354 = 598. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 299 + 751 = 1050. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 76 × 15 = 1147. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 900 + 150 = 1050. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 538 + 387 = 925. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 952 + 996 = 1943. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 235 + 562 = 789. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 30 × 65 = 1950. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 54 × 42 = 2271. Correct or wrong? (a) correct (b) wrong

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