Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 19 · 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: 20 × 38 = 766. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 33 × 12 = 394. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 18 × 47 = 846. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 327 + 243 = 570. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 99 × 75 = 7427. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 285 + 154 = 431. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 649 + 228 = 877. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 229 + 855 = 1084. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 669 + 657 = 1326. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 17 = 340. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 658 + 495 = 1153. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 45 = 670. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 57 × 24 = 1368. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 53 × 56 = 2968. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 90 × 81 = 7290. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 98 × 28 = 2744. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 911 + 777 = 1688. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 316 + 238 = 561. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 700 + 430 = 1130. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 141 + 581 = 721. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 647 + 889 = 1543. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 235 + 408 = 643. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 35 = 2205. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 160 + 454 = 614. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 81 × 55 = 4457. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 28 × 96 = 2695. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 163 + 752 = 915. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 26 × 55 = 1430. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 561 + 571 = 1125. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 197 + 555 = 752. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 53 = 2173. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 87 × 22 = 1910. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 504 + 303 = 807. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 98 × 23 = 2254. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 60 × 77 = 4620. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 985 + 466 = 1449. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 39 × 18 = 708. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 26 × 75 = 1953. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 686 + 803 = 1489. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 728 + 166 = 894. Correct or wrong? (a) correct (b) wrong

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