Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 869 · 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: 78 × 27 = 2114. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 136 + 137 = 273. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 278 + 898 = 1176. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 874 + 669 = 1549. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 16 × 75 = 1200. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 94 × 96 = 9021. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 276 + 323 = 593. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 297 + 879 = 1176. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 86 × 34 = 2916. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 491 + 703 = 1194. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 848 + 448 = 1294. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 934 + 930 = 1862. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 42 = 2611. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 771 + 831 = 1602. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 13 × 77 = 998. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 887 + 507 = 1394. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 87 × 50 = 4350. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 32 × 32 = 1029. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 84 × 22 = 1848. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 51 × 15 = 765. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 164 + 362 = 526. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 92 × 45 = 4140. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 69 × 29 = 2001. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 174 + 255 = 429. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 82 × 99 = 8118. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 58 × 66 = 3823. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 509 + 329 = 838. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 68 = 2448. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 48 × 43 = 2064. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 834 + 680 = 1510. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 31 = 2447. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 188 + 373 = 569. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 632 + 957 = 1589. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 413 + 183 = 597. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 66 × 29 = 1917. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 98 × 88 = 8624. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 52 × 17 = 884. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 39 × 66 = 2574. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 48 × 86 = 4128. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 70 = 6232. Correct or wrong? (a) wrong (b) correct

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