Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 802 · 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: 470 + 245 = 715. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 272 + 876 = 1148. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 46 × 67 = 3082. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 81 × 51 = 4138. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 53 × 30 = 1590. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 33 × 73 = 2409. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 72 × 75 = 5393. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 490 + 787 = 1278. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 544 + 992 = 1533. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 844 + 253 = 1096. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 47 × 43 = 2024. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 805 + 452 = 1257. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 989 + 842 = 1831. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 96 × 26 = 2489. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 88 × 45 = 3961. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 222 + 217 = 442. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 547 + 188 = 735. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 99 × 31 = 3069. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 236 + 851 = 1087. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 804 + 188 = 999. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 66 × 57 = 3762. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 398 + 516 = 916. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 49 = 4214. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 42 × 49 = 2058. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 476 + 597 = 1073. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 42 × 45 = 1890. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 21 = 458. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 69 × 68 = 4693. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 70 = 1190. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 571 + 414 = 987. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 49 × 33 = 1613. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 68 × 30 = 2040. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 161 + 763 = 924. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 26 × 18 = 468. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 180 + 213 = 393. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 693 + 380 = 1073. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 44 × 97 = 4268. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 184 + 245 = 429. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 23 × 42 = 966. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 285 + 169 = 454. Correct or wrong? (a) correct (b) wrong

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