Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 732 · 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: 167 + 143 = 310. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 854 + 338 = 1192. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 90 × 23 = 2070. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 461 + 260 = 721. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 679 + 221 = 900. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 155 + 871 = 1026. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 59 × 82 = 4843. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 332 + 943 = 1282. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 378 + 581 = 959. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 520 + 588 = 1104. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 428 + 877 = 1305. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 85 × 23 = 1957. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 214 + 267 = 480. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 74 × 52 = 3845. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 862 + 326 = 1181. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 30 × 42 = 1260. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 64 × 53 = 3392. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 949 + 207 = 1158. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 964 + 628 = 1592. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 335 + 128 = 463. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 413 + 920 = 1333. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 999 + 127 = 1130. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 30 × 65 = 1955. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 63 × 25 = 1578. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 77 × 98 = 7546. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 51 × 76 = 3876. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 711 + 840 = 1551. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 788 + 699 = 1487. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 80 = 2240. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 445 + 452 = 897. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 13 × 12 = 161. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 426 + 777 = 1203. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 46 × 45 = 2074. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 873 + 772 = 1645. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 39 × 97 = 3776. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 958 + 537 = 1496. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 71 × 50 = 3556. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 849 + 439 = 1286. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 14 × 41 = 574. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 31 × 81 = 2508. Correct or wrong? (a) correct (b) wrong

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