Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 150 · 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: 639 + 953 = 1592. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 310 + 814 = 1124. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 91 × 24 = 2191. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 31 × 42 = 1302. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 90 × 61 = 5489. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 94 × 17 = 1598. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 37 × 90 = 3338. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 885 + 679 = 1564. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 25 × 25 = 625. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 778 + 214 = 998. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 200 + 870 = 1068. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 34 = 2104. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 48 × 83 = 3984. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 93 × 15 = 1398. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 92 × 30 = 2763. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 357 + 282 = 639. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 322 + 423 = 753. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 392 + 644 = 1041. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 79 × 17 = 1345. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 46 × 35 = 1610. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 94 × 65 = 6104. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 605 + 360 = 972. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 328 + 350 = 684. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 88 × 33 = 2908. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 87 × 78 = 6784. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 663 + 374 = 1039. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 738 + 298 = 1044. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 970 + 915 = 1888. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 50 × 32 = 1604. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 59 × 73 = 4307. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 44 × 32 = 1400. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 92 × 56 = 5152. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 325 + 354 = 679. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 81 × 42 = 3402. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 26 × 21 = 547. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 788 + 165 = 961. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 245 + 263 = 508. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 20 × 97 = 1939. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 14 × 79 = 1106. Correct or wrong? (a) correct (b) wrong

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