Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 446 · 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: 42 × 42 = 1764. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 19 × 49 = 931. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 794 + 304 = 1098. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 62 × 15 = 930. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 78 = 1638. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 648 + 382 = 1035. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 84 × 17 = 1428. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 274 + 667 = 941. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 65 × 84 = 5454. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 128 + 425 = 553. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 427 + 778 = 1205. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 566 + 618 = 1190. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 31 × 85 = 2635. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 205 + 985 = 1190. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 233 + 321 = 554. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 608 + 592 = 1200. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 95 × 61 = 5795. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 29 = 605. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 73 × 91 = 6640. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 13 × 70 = 910. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 28 × 75 = 2104. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 295 + 361 = 660. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 32 × 44 = 1407. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 427 + 161 = 592. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 527 + 388 = 915. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 38 = 1824. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 40 × 23 = 920. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 370 + 153 = 523. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 99 × 67 = 6633. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 771 + 684 = 1455. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 561 + 330 = 886. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 188 + 875 = 1063. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 68 × 57 = 3868. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 34 × 18 = 620. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 41 × 17 = 705. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 137 + 339 = 480. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 708 + 147 = 859. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 206 + 604 = 813. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 20 × 92 = 1837. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 74 × 46 = 3401. Correct or wrong? (a) wrong (b) correct

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