Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 169 · 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: 73 × 89 = 6497. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 186 + 159 = 338. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 49 = 2793. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 45 = 855. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 265 + 446 = 716. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 541 + 785 = 1328. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 376 + 318 = 694. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 702 + 296 = 1002. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 77 × 74 = 5698. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 56 × 54 = 3024. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 68 × 85 = 5782. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 917 + 411 = 1328. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 92 × 97 = 8924. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 30 × 13 = 389. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 51 × 60 = 3066. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 200 + 166 = 366. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 26 × 94 = 2444. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 940 + 198 = 1132. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 803 + 950 = 1753. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 56 × 24 = 1344. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 585 + 325 = 910. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 32 = 1185. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 676 + 739 = 1415. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 936 + 165 = 1095. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 891 + 219 = 1110. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 72 × 23 = 1659. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 98 × 36 = 3528. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 81 × 54 = 4374. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 548 + 362 = 917. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 712 + 574 = 1291. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 345 + 520 = 862. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 17 = 578. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 41 × 92 = 3772. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 450 + 540 = 990. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 39 × 56 = 2184. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 56 × 23 = 1285. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 87 × 55 = 4787. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 18 × 95 = 1717. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 53 × 19 = 1013. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 432 + 860 = 1293. Correct or wrong? (a) wrong (b) correct

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