Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 507 · 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: 28 × 23 = 644. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 852 + 846 = 1698. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 93 × 27 = 2519. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 799 + 527 = 1329. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 249 + 844 = 1085. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 125 + 758 = 883. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 23 × 93 = 2139. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 89 × 99 = 8811. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 56 × 32 = 1793. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 40 × 38 = 1512. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 880 + 821 = 1701. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 71 × 35 = 2485. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 940 + 528 = 1468. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 588 + 641 = 1235. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 665 + 276 = 946. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 673 + 126 = 799. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 314 + 504 = 818. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 140 + 986 = 1126. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 970 + 196 = 1160. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 88 × 85 = 7480. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 298 + 536 = 830. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 356 + 208 = 564. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 786 + 340 = 1134. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 16 × 50 = 800. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 39 × 31 = 1209. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 239 + 993 = 1237. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 12 × 42 = 504. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 52 × 70 = 3640. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 83 × 84 = 6972. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 444 + 592 = 1031. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 27 × 20 = 540. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 79 × 98 = 7742. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 27 × 81 = 2187. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 805 + 596 = 1399. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 71 = 1353. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 857 + 893 = 1750. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 703 + 515 = 1220. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 25 × 64 = 1600. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 14 × 25 = 342. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 20 × 22 = 441. Correct or wrong? (a) wrong (b) correct

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