Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 911 · 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: 369 + 994 = 1363. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 755 + 312 = 1065. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 286 + 981 = 1267. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 86 = 3519. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 21 × 37 = 778. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 23 × 69 = 1594. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 43 = 1462. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 53 × 35 = 1855. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 20 × 33 = 660. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 18 × 74 = 1334. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 965 + 908 = 1873. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 72 × 23 = 1661. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 35 × 72 = 2513. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 904 + 508 = 1406. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 22 × 92 = 2031. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 205 + 749 = 948. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 58 × 76 = 4408. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 611 + 976 = 1592. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 701 + 427 = 1135. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 53 = 962. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 22 × 85 = 1873. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 88 × 30 = 2640. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 17 = 255. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 40 × 63 = 2520. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 48 × 21 = 1008. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 77 × 34 = 2624. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 531 + 372 = 897. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 61 × 80 = 4880. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 801 + 770 = 1571. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 238 + 337 = 576. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 48 × 93 = 4464. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 18 = 806. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 61 × 68 = 4148. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 85 × 67 = 5694. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 331 + 922 = 1257. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 59 × 79 = 4663. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 808 + 754 = 1562. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 445 + 957 = 1402. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 512 + 216 = 726. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 24 × 88 = 2105. Correct or wrong? (a) correct (b) wrong

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