Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 693 · 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: 93 × 46 = 4278. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 37 × 20 = 743. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 14 × 32 = 449. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 22 × 27 = 599. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 751 + 144 = 897. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 697 + 618 = 1315. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 99 = 2376. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 270 + 983 = 1256. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 88 × 13 = 1144. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 30 × 21 = 626. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 90 × 51 = 4591. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 534 + 682 = 1223. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 649 + 302 = 951. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 66 × 25 = 1650. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 40 × 23 = 920. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 229 + 570 = 799. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 769 + 955 = 1724. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 28 × 29 = 804. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 59 × 77 = 4546. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 54 × 97 = 5238. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 296 + 371 = 668. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 537 + 131 = 675. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 620 + 229 = 849. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 73 × 85 = 6206. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 141 + 718 = 859. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 39 × 79 = 3078. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 12 × 14 = 168. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 786 + 668 = 1454. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 80 × 26 = 2072. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 35 × 98 = 3437. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 204 + 653 = 859. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 34 × 97 = 3298. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 59 × 67 = 3953. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 677 + 266 = 943. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 95 × 52 = 4940. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 702 + 326 = 1028. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 725 + 141 = 866. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 78 × 76 = 5926. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 697 + 972 = 1669. Correct or wrong? (a) correct (b) wrong

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