Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 411 · 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: 345 + 500 = 850. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 78 × 32 = 2498. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 372 + 393 = 765. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 16 = 240. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 91 × 22 = 2002. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 94 × 84 = 7901. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 635 + 233 = 868. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 18 × 34 = 612. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 584 + 141 = 721. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 31 × 19 = 589. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 68 × 55 = 3740. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 939 + 793 = 1727. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 388 + 646 = 1040. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 87 × 31 = 2691. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 82 × 21 = 1722. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 92 × 61 = 5613. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 94 × 62 = 5828. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 68 × 65 = 4423. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 68 = 4422. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 39 × 61 = 2379. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 574 + 701 = 1275. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 362 + 304 = 668. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 90 × 30 = 2702. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 81 × 52 = 4212. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 12 = 372. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 258 + 741 = 1003. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 26 × 16 = 416. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 31 × 12 = 372. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 31 × 74 = 2288. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 578 + 993 = 1571. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 662 + 414 = 1076. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 93 = 1767. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 65 = 3770. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 309 + 353 = 663. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 938 + 960 = 1898. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 625 + 931 = 1556. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 525 + 998 = 1523. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 63 × 32 = 2016. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 56 × 58 = 3248. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 366 + 549 = 921. Correct or wrong? (a) correct (b) wrong

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