Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 174 · 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: 152 + 378 = 538. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 84 × 43 = 3612. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 59 × 24 = 1410. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 763 + 692 = 1457. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 73 × 35 = 2559. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 971 + 233 = 1204. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 25 × 20 = 500. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 47 × 16 = 752. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 45 × 95 = 4279. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 92 × 18 = 1656. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 17 × 86 = 1462. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 580 + 309 = 889. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 24 × 28 = 670. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 33 = 1683. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 21 × 48 = 1006. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 224 + 269 = 492. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 99 = 1194. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 347 + 820 = 1167. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 679 + 286 = 962. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 45 × 30 = 1350. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 17 × 58 = 988. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 323 + 628 = 951. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 24 × 26 = 626. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 80 × 66 = 5272. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 755 + 306 = 1064. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 64 × 30 = 1922. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 61 = 1159. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 15 × 65 = 975. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 187 + 812 = 1004. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 59 × 87 = 5133. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 337 + 241 = 577. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 17 = 969. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 55 × 78 = 4295. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 75 × 83 = 6231. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 863 + 978 = 1839. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 78 × 75 = 5850. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 43 × 36 = 1548. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 16 × 61 = 976. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 652 + 239 = 891. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 80 × 55 = 4396. Correct or wrong? (a) correct (b) wrong

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