Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 874 · 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: 187 + 825 = 1014. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 227 + 224 = 448. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 60 × 72 = 4328. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 551 + 423 = 974. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 967 + 330 = 1290. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 442 + 131 = 578. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 66 × 62 = 4092. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 452 + 709 = 1167. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 53 × 95 = 5035. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 14 × 60 = 840. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 754 + 408 = 1156. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 25 × 24 = 600. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 95 × 46 = 4370. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 89 × 48 = 4271. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 25 = 479. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 20 × 53 = 1060. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 20 × 13 = 267. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 816 + 620 = 1436. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 227 + 300 = 527. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 73 × 32 = 2337. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 33 × 27 = 891. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 33 × 23 = 759. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 78 = 2964. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 425 + 399 = 817. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 882 + 189 = 1066. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 76 × 87 = 6612. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 769 + 485 = 1260. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 302 + 288 = 595. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 731 + 328 = 1063. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 71 = 6390. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 55 × 72 = 3960. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 78 × 19 = 1485. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 14 × 83 = 1162. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 85 × 62 = 5263. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 80 × 19 = 1520. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 225 + 148 = 373. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 286 + 273 = 559. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 39 × 20 = 780. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 380 + 355 = 734. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 23 × 68 = 1564. Correct or wrong? (a) correct (b) wrong

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