Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 408 · 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: 372 + 208 = 583. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 121 + 453 = 569. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 15 × 57 = 858. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 45 × 65 = 2925. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 77 × 55 = 4235. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 215 + 268 = 483. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 22 × 19 = 426. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 825 + 475 = 1300. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 19 × 22 = 412. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 627 + 716 = 1343. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 609 + 405 = 1013. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 35 × 21 = 727. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 760 + 951 = 1711. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 917 + 566 = 1486. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 33 × 74 = 2442. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 234 + 697 = 933. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 45 × 88 = 3960. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 40 = 1000. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 80 × 42 = 3365. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 35 × 48 = 1680. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 483 + 612 = 1095. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 20 × 17 = 340. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 366 + 521 = 887. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 469 + 435 = 904. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 187 + 308 = 495. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 273 + 497 = 770. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 409 + 999 = 1416. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 99 × 92 = 9111. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 886 + 821 = 1709. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 142 + 129 = 271. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 865 + 707 = 1571. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 40 × 42 = 1680. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 77 × 21 = 1621. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 542 + 327 = 870. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 187 + 208 = 395. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 32 × 22 = 703. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 32 × 65 = 2076. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 20 × 20 = 407. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 12 × 49 = 582. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 62 = 2232. Correct or wrong? (a) correct (b) wrong

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