Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 552 · 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: 45 × 80 = 3596. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 207 + 754 = 969. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 47 × 22 = 1042. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 28 × 91 = 2548. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 88 × 53 = 4664. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 580 + 795 = 1369. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 17 × 44 = 748. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 519 + 153 = 672. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 12 = 288. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 30 × 50 = 1500. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 28 × 12 = 335. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 31 × 26 = 806. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 214 + 901 = 1109. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 31 × 20 = 619. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 263 + 869 = 1125. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 84 × 87 = 7312. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 84 × 31 = 2604. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 867 + 385 = 1257. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 48 × 37 = 1784. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 131 + 180 = 303. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 76 = 993. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 29 × 98 = 2842. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 367 + 764 = 1128. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 48 × 64 = 3072. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 835 + 682 = 1517. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 97 × 30 = 2913. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 516 + 987 = 1503. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 83 × 15 = 1250. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 51 × 33 = 1683. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 946 + 562 = 1509. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 53 × 78 = 4134. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 50 × 92 = 4608. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 973 + 399 = 1374. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 566 + 464 = 1037. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 22 × 24 = 532. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 344 + 510 = 854. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 71 × 28 = 1988. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 69 = 2483. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 265 + 344 = 617. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 82 × 81 = 6638. Correct or wrong? (a) correct (b) wrong

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