Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 111 · 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: 356 + 718 = 1069. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 97 × 70 = 6790. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 85 × 30 = 2550. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 66 × 77 = 5089. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 206 + 834 = 1040. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 98 = 4018. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 89 × 27 = 2403. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 852 + 168 = 1012. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 594 + 270 = 864. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 222 + 914 = 1136. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 99 × 47 = 4647. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 67 = 5092. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 40 × 84 = 3367. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 557 + 335 = 892. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 32 × 20 = 642. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 83 × 23 = 1909. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 650 + 867 = 1517. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 72 × 86 = 6192. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 680 + 376 = 1061. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 184 + 308 = 492. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 72 × 51 = 3680. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 533 + 361 = 894. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 48 × 79 = 3792. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 568 + 299 = 867. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 76 × 88 = 6692. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 63 × 47 = 2958. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 65 = 2015. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 787 + 589 = 1379. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 48 × 58 = 2784. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 793 + 955 = 1748. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 586 + 211 = 797. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 44 × 33 = 1452. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 81 × 25 = 2028. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 898 + 153 = 1052. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 850 + 741 = 1591. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 91 × 80 = 7281. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 45 × 73 = 3285. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 152 + 233 = 385. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 328 + 124 = 452. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 66 × 44 = 2904. Correct or wrong? (a) correct (b) wrong

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