Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 912 · 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: 652 + 696 = 1356. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 13 × 89 = 1156. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 193 + 690 = 882. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 372 + 277 = 647. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 25 = 1073. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 326 + 352 = 685. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 22 = 399. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 90 × 89 = 8010. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 803 + 223 = 1026. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 74 × 91 = 6734. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 436 + 879 = 1314. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 42 × 39 = 1641. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 63 × 65 = 4093. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 89 × 55 = 4895. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 971 + 830 = 1794. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 395 + 937 = 1332. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 596 + 455 = 1045. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 601 + 587 = 1188. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 22 × 42 = 924. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 120 + 949 = 1076. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 66 × 17 = 1122. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 28 = 1928. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 58 × 88 = 5104. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 473 + 201 = 670. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 16 × 96 = 1536. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 792 + 195 = 987. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 390 + 629 = 1024. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 485 + 707 = 1192. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 176 + 875 = 1051. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 95 × 85 = 8071. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 60 × 70 = 4200. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 187 + 229 = 416. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 641 + 228 = 869. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 120 + 616 = 740. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 42 × 69 = 2898. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 81 × 59 = 4779. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 30 × 83 = 2490. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 33 × 51 = 1684. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 73 × 70 = 5110. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 760 + 300 = 1060. Correct or wrong? (a) correct (b) wrong

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