Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 615 · 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: 38 × 89 = 3382. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 400 + 162 = 555. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 439 + 729 = 1166. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 618 + 749 = 1367. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 57 × 58 = 3309. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 70 × 96 = 6726. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 44 × 83 = 3652. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 484 + 777 = 1261. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 91 × 70 = 6368. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 492 + 240 = 739. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 963 + 592 = 1555. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 22 × 24 = 531. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 95 = 5225. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 34 × 12 = 409. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 722 + 321 = 1045. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 61 = 5307. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 301 + 235 = 536. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 795 + 290 = 1085. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 46 × 30 = 1380. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 29 × 77 = 2233. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 339 + 549 = 884. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 613 + 260 = 866. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 32 × 55 = 1760. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 240 + 410 = 652. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 758 + 168 = 926. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 97 × 31 = 3012. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 76 × 80 = 6080. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 595 + 602 = 1197. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 852 + 563 = 1412. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 68 × 40 = 2720. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 635 + 210 = 845. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 64 × 18 = 1152. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 497 + 673 = 1174. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 271 + 966 = 1237. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 27 × 84 = 2268. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 683 + 688 = 1368. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 48 × 45 = 2153. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 673 + 534 = 1207. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 77 × 30 = 2310. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 758 + 796 = 1554. Correct or wrong? (a) wrong (b) correct

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