400 in Binary

The process of converting 400 from decimal to binary involves dividing the number 400 by 2. Here, it is divided by 2 because the binary number system uses only 2 digits (0 and 1). The quotient becomes the dividend in the next step, and the process continues until the quotient becomes 0.

This is a commonly used method to convert 400 to binary. In the last step, the remainder is noted down from bottom to top, and that becomes the converted value. The remainders noted down after dividing 400 by 2 until getting 0 as the quotient is 110010000. Remember, the remainders here have been written upside down.

In the table shown below, the first column shows the binary digits (1 and 0) as 110010000.

The second column represents the place values of each digit, and the third column is the value calculation, where the binary digits are multiplied by their corresponding place values.

The results of the third column can be added to cross-check if 110010000 in binary is indeed 400 in the decimal number system.

400 can be converted easily from decimal to binary. The methods mentioned below will help us convert the number. Let’s see how it is done.

Expansion Method: Let us see the step-by-step process of converting 400 using the expansion method.

Step 1 - Figure out the place values: In the binary system, each place value is a power of 2. Therefore, in the first step, we will ascertain the powers of 2. 2⁰ = 1 2¹ = 2 2² = 4 2³ = 8 2⁴ = 16 2⁵ = 32 2⁶ = 64 2⁷ = 128 2⁸ = 256 Since 256 is less than 400, we stop here.

Step 2 - Identify the largest power of 2: In the previous step, we stopped at 2⁸ = 256. This is because we need to identify the largest power of 2, which is less than or equal to the given number, 400. Since 2⁸ is the number we are looking for, write 1 in the 2⁸ place. Now the value of 2⁸, which is 256, is subtracted from 400. 400 - 256 = 144.

Step 3 - Identify the next largest power of 2: In this step, we need to find the largest power of 2 that fits into the result of the previous step, 144. So, the next largest power of 2 is 2⁷ = 128. Now, we have to write 1 in the 2⁷ place. And then subtract 128 from 144. 144 - 128 = 16.

Step 4 - Identify the next largest power of 2: The next largest power of 2 that fits into 16 is 2⁴ = 16. Write 1 in the 2⁴ place. Subtract 16 from 16. 16 - 16 = 0. We need to stop the process here since the remainder is 0.

Step 5 - Identify the unused place values: In the previous steps, we wrote 1 in the 2⁸, 2⁷, and 2⁴ places. Now, we can just write 0s in the remaining places. Now, by substituting the values, we get: 0 in the 2⁰ place 0 in the 2¹ place 0 in the 2² place 0 in the 2³ place 1 in the 2⁴ place 0 in the 2⁵ place 0 in the 2⁶ place 1 in the 2⁷ place 1 in the 2⁸ place

Step 6 - Write the values in reverse order: We now write the numbers upside down to represent 400 in binary. Therefore, 110010000 is 400 in binary.

Grouping Method: In this method, we divide the number 400 by 2. Let us see the step-by-step conversion.

Step 1 - Divide the given number 400 by 2. 400 / 2 = 200. Here, 200 is the quotient and 0 is the remainder.

Step 2 - Divide the previous quotient (200) by 2. 200 / 2 = 100. Here, the quotient is 100 and the remainder is 0.

Step 3 - Repeat the previous step. 100 / 2 = 50. Now, the quotient is 50, and 0 is the remainder.

Step 4 - Repeat the previous step. 50 / 2 = 25. Here, the remainder is 0.

Step 5 - Repeat the previous step. 25 / 2 = 12. Here, the remainder is 1.

Step 6 - Repeat the previous step. 12 / 2 = 6. Here, the remainder is 0.

Step 7 - Repeat the previous step. 6 / 2 = 3. Here, the remainder is 0.

Step 8 - Repeat the previous step. 3 / 2 = 1. Here, the remainder is 1.

Step 9 - Repeat the previous step. 1 / 2 = 0. Here, the remainder is 1. And we stop the division here because the quotient is 0.

Step 10 - Write down the remainders from bottom to top. Therefore, 400 (decimal) = 110010000 (binary).

There are certain rules to follow when converting any number to binary. Some of them are mentioned below:

Rule 1: Place Value Method

This is one of the most commonly used rules to convert any number to binary. The place value method is the same as the expansion method, where we need to find the largest power of 2. Let’s see a brief step-by-step explanation to understand the first rule. Find the largest power of 2 less than or equal to 400. Since the answer is 2⁸, write 1 next to this power of 2. Subtract the value (256) from 400. So, 400 - 256 = 144. Find the largest power of 2 less than or equal to 144. The answer is 2⁷. So, write 1 next to this power. Now, 144 - 128 = 16. The next largest power is 2⁴, so write 1 next to it. Now 16 - 16 = 0. Since there is no remainder, we can write 0 next to the remaining powers (2⁰, 2¹, 2², 2³, 2⁵, and 2⁶). Final conversion will be 110010000.

Rule 2: Division by 2 Method

The division by 2 method is the same as the grouping method. A brief step-by-step explanation is given below for better understanding. First, 400 is divided by 2 to get 200 as the quotient and 0 as the remainder. Now, 200 is divided by 2. Here, we will get 100 as the quotient and 0 as the remainder. Dividing 100 by 2, we get 50 as the quotient and 0 as the remainder. Divide 50 by 2 to get 25 as the quotient and 0 as the remainder. Divide 25 by 2 to get 12 as the quotient and 1 as the remainder. Divide 12 by 2 to get 6 as the quotient and 0 as the remainder. Divide 6 by 2 to get 3 as the quotient and 0 as the remainder. Divide 3 by 2 to get 1 as the quotient and 1 as the remainder. Divide 1 by 2 to get 0 as the quotient and 1 as the remainder. We stop the division once the quotient becomes 0. Now, we write the remainders upside down to get the binary equivalent of 400, 110010000.

Rule 3: Representation Method

This rule also involves breaking of the number into powers of 2. Identify the powers of 2 and write it down in decreasing order i.e., 2⁸, 2⁷, 2⁶, 2⁵, 2⁴, 2³, 2², 2¹, and 2⁰. Find the largest power that fits into 400. Repeat the process and allocate 1s and 0s to the suitable powers of 2. Combine the digits (0 and 1) to get the binary result.

Rule 4: Limitation Rule

The limitation of the binary system is that only 0s and 1s can be used to represent numbers. The system doesn’t use any other digits other than 0 and 1. This is a base 2 number system, where the binary places represent powers of 2. So, every digit is either a 0 or a 1. To convert 400, we use 0s for 2⁰, 2¹, 2², 2³, 2⁵, and 2⁶ and 1s for 2⁴, 2⁷, and 2⁸.

Learning a few tips and tricks is a great way to solve any mathematical problems easily. Let us take a look at some tips and tricks for binary numbers up to 400.

Memorize to speed up conversions: We can memorize the binary forms for powers of 2.

Recognize the patterns: There is a peculiar pattern when converting numbers from decimal to binary. 1 → 1 1 + 1 = 2 → 10 2 + 2 = 4 → 100 4 + 4 = 8 → 1000 8 + 8 = 16 → 10000 16 + 16 = 32 → 100000 …and so on. This is also called the double and add rule.

Even and odd rule: Whenever a number is even, its binary form will end in 0. For example, 400 is even, and its binary form is 110010000. Here, the binary of 400 ends in 0. If the number is odd, then its binary equivalent will end in 1.

Cross-verify the answers: Once the conversion is done, we can cross-verify the answers by converting the number back to the decimal form. This will eliminate any unforeseen errors in conversion.

Practice by using tables: Writing the decimal numbers and their binary equivalents on a table will help us remember the conversions.

• Decimal: It is the base 10 number system which uses digits from 0 to 9.

• Binary: This number system uses only 0 and 1. It is also called the base 2 number system.

• Place value: Every digit has a value based on its position in a given number. For example, in 102 (base 10), 1 has occupied the hundreds place, 0 is in the tens place, and 2 is in the ones place.

• Octal: It is the number system with a base of 8. It uses digits from 0 to 7.

• Power of 2: In binary, each position represents a power of 2, determining the place value of each digit.