Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 442 · 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: 97 × 43 = 4171. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 722 + 597 = 1321. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 35 × 19 = 665. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 243 + 437 = 680. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 514 + 577 = 1091. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 78 × 39 = 3042. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 403 + 439 = 839. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 358 + 439 = 801. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 72 × 78 = 5611. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 993 + 321 = 1311. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 78 × 97 = 7566. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 979 + 342 = 1314. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 34 × 84 = 2856. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 136 + 142 = 278. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 436 + 364 = 800. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 91 × 72 = 6552. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 38 × 40 = 1519. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 731 + 243 = 975. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 14 × 73 = 1021. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 732 + 967 = 1691. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 266 + 539 = 805. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 47 = 611. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 54 × 59 = 3186. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 50 = 1000. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 99 × 47 = 4661. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 52 × 61 = 3172. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 19 × 97 = 1843. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 75 = 1493. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 93 × 41 = 3821. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 76 × 32 = 2437. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 569 + 714 = 1281. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 874 + 212 = 1086. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 12 × 49 = 588. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 241 + 884 = 1125. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 36 × 49 = 1763. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 40 × 96 = 3840. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 51 × 37 = 1887. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 367 + 542 = 909. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 85 × 41 = 3493. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 692 + 252 = 944. Correct or wrong? (a) correct (b) wrong

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