Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 470 · 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: 20 × 47 = 940. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 783 + 400 = 1183. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 396 + 327 = 717. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 36 × 39 = 1401. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 851 + 959 = 1810. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 30 × 75 = 2250. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 16 = 295. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 805 + 809 = 1612. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 72 × 90 = 6479. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 896 + 729 = 1633. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 630 + 512 = 1142. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 71 × 16 = 1136. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 128 + 635 = 764. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 824 + 693 = 1518. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 127 + 206 = 325. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 69 × 49 = 3381. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 566 + 192 = 753. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 59 × 27 = 1596. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 76 × 34 = 2584. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 62 × 83 = 5143. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 488 + 493 = 981. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 269 + 824 = 1093. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 292 + 693 = 985. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 40 = 1517. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 53 × 16 = 848. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 28 × 78 = 2188. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 53 × 47 = 2487. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 30 × 36 = 1086. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 123 + 259 = 382. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 51 × 40 = 2044. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 81 × 15 = 1218. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 96 × 71 = 6816. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 36 × 73 = 2636. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 241 + 277 = 518. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 30 × 75 = 2250. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 42 = 3910. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 20 × 17 = 340. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 78 × 39 = 3042. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 53 × 29 = 1533. Correct or wrong? (a) wrong (b) correct

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