Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 292 · 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: 269 + 921 = 1190. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 432 + 548 = 983. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 693 + 931 = 1625. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 442 + 851 = 1293. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 48 = 622. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 41 × 75 = 3076. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 809 + 656 = 1465. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 57 × 15 = 854. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 917 + 837 = 1754. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 333 + 484 = 816. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 670 + 358 = 1035. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 912 + 568 = 1480. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 678 + 418 = 1103. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 93 × 46 = 4278. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 34 × 30 = 1018. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 20 × 20 = 400. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 458 + 192 = 650. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 74 × 39 = 2886. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 558 + 969 = 1527. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 62 × 28 = 1736. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 772 + 190 = 966. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 20 = 260. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 615 + 698 = 1313. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 742 + 248 = 990. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 54 × 55 = 2970. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 555 + 980 = 1535. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 757 + 821 = 1578. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 906 + 926 = 1833. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 47 × 71 = 3337. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 60 × 24 = 1441. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 83 × 35 = 2905. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 63 × 61 = 3844. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 95 × 39 = 3698. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 160 + 960 = 1114. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 99 × 43 = 4257. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 64 × 91 = 5829. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 132 + 232 = 356. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 81 × 43 = 3484. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 68 × 52 = 3536. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 84 × 96 = 8056. Correct or wrong? (a) correct (b) wrong

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