Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 905 · 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: 844 + 589 = 1433. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 30 × 40 = 1200. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 95 × 98 = 9310. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 305 + 585 = 890. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 744 + 530 = 1269. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 76 × 26 = 1974. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 925 + 484 = 1413. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 145 + 450 = 595. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 483 + 716 = 1199. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 23 × 73 = 1679. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 74 = 3480. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 791 + 493 = 1289. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 274 + 440 = 714. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 967 + 842 = 1817. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 66 × 52 = 3432. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 137 + 665 = 796. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 77 × 18 = 1386. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 34 × 30 = 1020. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 701 + 695 = 1396. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 751 + 310 = 1061. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 68 = 5984. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 25 × 98 = 2450. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 598 + 665 = 1263. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 99 = 8118. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 752 + 967 = 1719. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 99 × 43 = 4254. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 603 + 571 = 1174. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 441 + 593 = 1039. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 26 × 40 = 1034. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 857 + 253 = 1112. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 323 + 182 = 505. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 93 = 3061. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 288 + 244 = 532. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 329 + 583 = 912. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 874 + 508 = 1378. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 83 × 88 = 7311. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 65 × 66 = 4290. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 885 + 825 = 1718. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 53 × 17 = 900. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 63 × 22 = 1386. Correct or wrong? (a) wrong (b) correct

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