Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 130 · 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: 90 × 24 = 2160. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 60 × 65 = 3900. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 55 × 20 = 1093. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 306 + 722 = 1028. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 303 + 704 = 1007. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 254 + 951 = 1205. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 419 + 191 = 617. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 24 = 528. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 546 + 381 = 927. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 94 × 80 = 7518. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 875 + 500 = 1367. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 338 + 863 = 1209. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 81 × 50 = 4042. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 17 × 45 = 763. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 305 + 490 = 796. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 87 × 32 = 2784. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 829 + 995 = 1824. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 942 + 327 = 1269. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 93 × 13 = 1206. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 31 = 550. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 695 + 392 = 1084. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 95 × 88 = 8364. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 27 × 28 = 759. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 967 + 395 = 1359. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 968 + 517 = 1485. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 29 × 51 = 1479. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 62 = 868. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 55 × 14 = 768. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 92 = 2579. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 54 = 3301. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 650 + 496 = 1145. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 135 + 616 = 751. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 204 + 643 = 854. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 33 × 46 = 1518. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 20 × 83 = 1660. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 251 + 482 = 733. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 270 + 652 = 922. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 435 + 784 = 1220. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 36 × 51 = 1836. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 89 = 2840. Correct or wrong? (a) wrong (b) correct

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