Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 637 · 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: 365 + 947 = 1319. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 71 = 5041. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 73 × 37 = 2706. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 71 × 26 = 1846. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 36 × 62 = 2238. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 387 + 125 = 506. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 70 = 5040. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 386 + 994 = 1372. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 59 × 89 = 5251. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 247 + 795 = 1042. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 900 + 360 = 1260. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 84 × 17 = 1428. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 55 × 49 = 2695. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 872 + 219 = 1091. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 511 + 238 = 747. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 50 × 55 = 2750. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 45 × 29 = 1303. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 83 = 2319. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 941 + 246 = 1183. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 44 × 82 = 3610. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 89 = 1869. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 849 + 899 = 1756. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 385 + 603 = 988. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 814 + 352 = 1165. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 56 × 92 = 5155. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 146 + 488 = 634. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 12 × 87 = 1048. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 21 × 54 = 1134. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 47 × 12 = 561. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 70 × 66 = 4620. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 48 × 26 = 1252. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 29 × 75 = 2176. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 648 + 778 = 1429. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 87 × 52 = 4524. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 48 × 19 = 912. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 66 × 35 = 2310. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 29 × 59 = 1705. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 43 × 24 = 1032. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 66 × 27 = 1782. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 25 × 23 = 575. Correct or wrong? (a) wrong (b) correct

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