Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 109 · 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: 85 × 14 = 1190. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 708 + 626 = 1334. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 972 + 952 = 1917. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 26 × 52 = 1352. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 37 × 60 = 2225. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 85 × 73 = 6205. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 19 = 456. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 90 × 97 = 8736. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 222 + 829 = 1051. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 75 = 2101. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 29 × 76 = 2204. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 392 + 150 = 542. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 28 × 68 = 1908. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 77 × 61 = 4697. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 91 × 76 = 6914. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 16 × 21 = 336. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 96 = 2784. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 63 × 34 = 2144. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 15 × 24 = 368. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 81 × 43 = 3483. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 46 × 90 = 4140. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 311 + 163 = 479. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 520 + 384 = 904. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 83 × 84 = 6972. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 370 + 593 = 963. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 58 × 37 = 2145. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 344 + 781 = 1120. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 96 × 83 = 7968. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 910 + 210 = 1115. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 347 + 420 = 765. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 12 × 94 = 1127. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 789 + 198 = 994. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 542 + 556 = 1098. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 150 + 630 = 780. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 448 + 251 = 699. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 54 × 69 = 3726. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 41 = 782. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 68 × 58 = 3947. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 55 × 86 = 4730. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 56 × 23 = 1288. Correct or wrong? (a) wrong (b) correct

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