Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 729 · 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: 45 × 73 = 3285. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 887 + 267 = 1154. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 40 × 83 = 3320. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 65 × 47 = 3053. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 255 + 348 = 603. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 324 + 555 = 879. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 37 × 41 = 1517. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 646 + 756 = 1402. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 36 × 50 = 1800. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 338 + 557 = 893. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 331 + 438 = 771. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 59 × 67 = 3945. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 48 × 42 = 2011. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 681 + 322 = 1002. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 26 × 45 = 1170. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 668 + 853 = 1517. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 622 + 740 = 1363. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 251 + 442 = 696. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 59 = 1062. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 546 + 577 = 1125. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 346 + 498 = 844. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 59 × 14 = 822. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 51 × 65 = 3312. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 61 × 18 = 1098. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 446 + 211 = 660. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 51 × 72 = 3672. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 697 + 124 = 822. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 145 + 139 = 284. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 32 × 23 = 736. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 31 × 72 = 2232. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 31 = 2455. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 61 × 70 = 4270. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 548 + 363 = 911. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 571 + 383 = 952. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 26 = 2478. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 847 + 869 = 1710. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 415 + 191 = 606. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 82 × 95 = 7787. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 77 × 99 = 7623. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 81 × 16 = 1296. Correct or wrong? (a) wrong (b) correct

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