Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 551 · 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: 56 × 64 = 3584. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 98 × 12 = 1184. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 20 × 98 = 1960. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 15 × 46 = 693. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 58 × 22 = 1276. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 890 + 379 = 1271. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 683 + 918 = 1607. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 15 × 94 = 1410. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 64 × 44 = 2816. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 96 × 99 = 9496. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 44 × 76 = 3344. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 714 + 756 = 1470. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 624 + 257 = 879. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 54 × 57 = 3074. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 78 × 93 = 7254. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 63 = 1506. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 284 + 760 = 1044. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 82 × 33 = 2698. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 82 × 76 = 6227. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 434 + 274 = 708. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 811 + 355 = 1163. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 431 + 542 = 973. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 20 × 19 = 380. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 535 + 789 = 1324. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 16 × 31 = 499. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 61 × 56 = 3416. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 54 × 46 = 2484. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 545 + 551 = 1095. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 197 + 288 = 485. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 675 + 448 = 1129. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 696 + 890 = 1587. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 32 × 16 = 511. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 870 + 583 = 1453. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 29 × 29 = 841. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 946 + 768 = 1716. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 79 × 91 = 7191. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 803 + 265 = 1068. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 350 + 876 = 1226. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 598 + 669 = 1266. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 784 + 784 = 1568. Correct or wrong? (a) correct (b) wrong

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