Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 393 · 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: 216 + 278 = 494. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 778 + 423 = 1201. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 868 + 859 = 1721. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 584 + 826 = 1410. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 56 × 88 = 4927. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 29 = 2490. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 90 × 86 = 7740. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 49 = 3871. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 537 + 551 = 1088. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 29 × 38 = 1105. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 273 + 328 = 601. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 44 × 49 = 2156. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 35 × 84 = 2940. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 78 × 92 = 7174. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 22 × 24 = 523. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 57 × 32 = 1829. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 365 + 707 = 1067. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 69 × 53 = 3654. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 974 + 168 = 1142. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 362 + 535 = 897. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 597 + 575 = 1172. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 27 × 95 = 2565. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 950 + 329 = 1271. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 66 × 89 = 5874. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 342 + 314 = 656. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 933 + 562 = 1487. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 16 × 42 = 675. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 370 + 696 = 1066. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 655 + 840 = 1495. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 47 × 78 = 3666. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 785 + 346 = 1129. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 13 × 51 = 665. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 162 + 306 = 469. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 16 × 18 = 295. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 33 × 35 = 1155. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 87 × 19 = 1657. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 21 × 13 = 272. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 56 × 16 = 896. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 720 + 163 = 884. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 728 + 909 = 1637. Correct or wrong? (a) wrong (b) correct

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