Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 882 · 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: 405 + 643 = 1048. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 882 + 391 = 1273. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 12 × 79 = 950. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 338 + 138 = 476. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 98 × 44 = 4312. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 536 + 346 = 882. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 331 + 627 = 960. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 454 + 708 = 1169. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 435 + 459 = 900. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 60 = 3900. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 56 × 69 = 3864. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 44 × 63 = 2772. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 248 + 461 = 711. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 717 + 211 = 935. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 69 × 98 = 6762. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 774 + 752 = 1526. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 436 + 235 = 671. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 16 × 13 = 211. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 57 × 46 = 2614. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 74 × 82 = 6068. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 38 × 29 = 1105. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 96 × 32 = 3072. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 339 + 251 = 590. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 58 × 42 = 2439. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 75 × 32 = 2401. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 221 + 349 = 570. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 64 × 46 = 2944. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 40 × 16 = 636. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 304 + 703 = 1007. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 210 + 287 = 502. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 43 × 95 = 4085. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 72 × 88 = 6336. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 98 × 73 = 7148. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 58 × 45 = 2617. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 51 × 66 = 3374. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 15 × 25 = 377. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 924 + 860 = 1778. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 57 × 40 = 2277. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 65 × 40 = 2600. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 144 + 697 = 841. Correct or wrong? (a) correct (b) wrong

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