Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 438 · 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: 939 + 315 = 1250. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 57 × 76 = 4332. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 81 × 74 = 5988. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 70 × 12 = 840. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 28 = 707. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 577 + 562 = 1146. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 43 × 47 = 2021. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 230 + 622 = 852. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 270 + 616 = 886. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 12 × 49 = 588. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 38 × 86 = 3268. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 40 × 71 = 2840. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 98 × 46 = 4502. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 78 = 1404. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 70 × 65 = 4554. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 53 × 30 = 1590. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 24 × 31 = 744. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 172 + 144 = 316. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 70 × 69 = 4823. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 89 = 8633. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 122 + 630 = 752. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 522 + 639 = 1156. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 577 + 444 = 1021. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 389 + 169 = 558. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 37 × 58 = 2146. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 675 + 734 = 1409. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 459 + 171 = 623. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 35 × 85 = 2975. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 494 + 984 = 1484. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 58 × 15 = 866. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 845 + 291 = 1136. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 237 + 994 = 1231. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 61 × 83 = 5063. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 15 × 70 = 1048. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 423 + 336 = 759. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 332 + 771 = 1107. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 36 × 98 = 3522. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 57 × 21 = 1203. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 17 = 459. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 26 × 79 = 2054. Correct or wrong? (a) wrong (b) correct

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