Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 496 · 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: 673 + 438 = 1111. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 79 × 29 = 2291. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 900 + 829 = 1729. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 244 + 717 = 961. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 62 × 15 = 930. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 55 × 31 = 1705. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 15 × 28 = 423. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 98 × 41 = 4024. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 34 × 87 = 2958. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 34 × 85 = 2888. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 52 = 1197. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 325 + 145 = 470. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 33 × 62 = 2041. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 989 + 675 = 1664. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 43 × 38 = 1634. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 498 + 748 = 1246. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 18 × 51 = 918. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 80 = 3600. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 82 × 48 = 3933. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 784 + 426 = 1217. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 844 + 549 = 1399. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 550 + 312 = 861. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 784 + 273 = 1057. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 16 × 17 = 272. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 61 × 47 = 2868. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 298 + 489 = 788. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 66 = 5213. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 884 + 699 = 1583. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 694 + 898 = 1592. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 76 × 45 = 3420. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 258 + 772 = 1031. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 995 + 492 = 1487. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 57 × 68 = 3876. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 355 + 473 = 828. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 387 + 739 = 1119. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 303 + 948 = 1251. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 682 + 941 = 1623. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 527 + 501 = 1021. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 58 × 43 = 2502. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 94 = 3390. Correct or wrong? (a) correct (b) wrong

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