Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 620 · 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: 141 + 232 = 373. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 318 + 678 = 996. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 65 = 1040. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 818 + 745 = 1563. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 49 = 1668. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 75 × 16 = 1200. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 20 × 79 = 1581. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 988 + 178 = 1166. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 462 + 615 = 1083. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 835 + 151 = 986. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 40 × 30 = 1200. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 24 × 61 = 1466. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 95 = 3613. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 80 × 13 = 1040. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 58 × 25 = 1457. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 75 × 96 = 7200. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 305 + 994 = 1299. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 54 = 4316. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 844 + 881 = 1722. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 274 + 936 = 1210. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 993 + 777 = 1770. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 144 + 927 = 1071. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 68 = 2591. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 45 × 43 = 1942. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 648 + 461 = 1109. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 972 + 347 = 1319. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 70 × 92 = 6440. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 52 × 89 = 4620. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 91 × 32 = 2911. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 48 × 59 = 2836. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 74 × 29 = 2144. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 73 × 66 = 4818. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 505 + 331 = 830. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 64 × 79 = 5056. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 387 + 161 = 548. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 29 × 39 = 1131. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 65 × 95 = 6168. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 66 × 55 = 3635. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 233 + 385 = 610. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 54 × 30 = 1620. Correct or wrong? (a) wrong (b) correct

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