Q&A for How to Convert from Decimal to Octal

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How I convert octal to decimal?

Community Answer

Every number in the ones place counts as one, every number in the tens place counts as 8 and every number in the 100's place counts as 64. Use this formula to find the answer. Example: 326; 3(64)+2(8)+6(1); 192+16+6; 214.

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What is 40 decimal converted to octal solution?

Purplecakecaroline

Community Answer

50 octal is the solution you are looking for.

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How can I convert the decimal number 645 into octal number?

Community Answer

645÷8=80 rem 5 and then 80÷8=10 rem 0, next 10÷8=1 rem 2 and finally 1÷8=0 rem 1. The remainders in ascending order are the answer so you answer is 1205.

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Do I need this for my GCSE?

Cluster Duck

Community Answer

As of time of writing, octal is not needed in any of the GCSE specifications. It does appear in the ASCII table but you probably won't even use these values. If they do appear in your exam, you will have the provided information required to answer the question.

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How many octal numbers that start with a digit greater but not equal than 5 can be written by using no more than 6 digits?

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You have 2 choices for the first digit (6 or 7), followed by up to 5 digits which can be any of the 8 base 8 digits. Set it up as 2(1 + 8 + 8^2 + 8^3 + 8^4 + 8^5), or realise that the geometric series simplifies to 2(8^6-1)/7. Whichever way you choose to compute it, you will find 74898 number satisfying your constraint.

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