645 in Binary

Decimal 645 in binary conversion provides the detailed information on what is the binary equivalent of (645)10, and the step-by-step work for how to convert the decimal (base-10) number 645 to its binary (base-2) equivalent.

(645)10 in binary is equal to:
(645)₁₀ = (?)₂
Perform successive MOD-2 operation for decimal 645, and mark the initial remainder as LSB and the final remainder as MSB as like the below.

645 MOD-2	645 / 2 = 322	Remainder is 1 → LSB
322 MOD-2	322 / 2 = 161	Remainder is 0
161 MOD-2	161 / 2 = 80	Remainder is 1
80 MOD-2	80 / 2 = 40	Remainder is 0
40 MOD-2	40 / 2 = 20	Remainder is 0
20 MOD-2	20 / 2 = 10	Remainder is 0
10 MOD-2	10 / 2 = 5	Remainder is 0
5 MOD-2	5 / 2 = 2	Remainder is 1
2 MOD-2	2 / 2 = 1	Remainder is 0
1 MOD-2	1 / 2 = 0	Remainder is 1 → MSB

Arrange the remainders from MSB to LSB forms the binary equivalent of 645.
645₁₀ = 1010000101₂

Hence,
645 in binary is 1010000101

where,
645₁₀ is the given decimal number,
10 in 645₁₀ represents the base-10 or decimal number system,
1010000101₂ is the binary equivalent of the decimal 41,
2 in 1010000101₂ represents the base-2 or binary number system.

Important Notes: (645)10 in Binary
The below are some of the important notes to be remembered while converting the base-10 number 645 into a binary number.

1. The initial or first remainder while performing MOD-2 operation for 645 is a Least Significant Bit (LSB).
2. The last remainder while performing MOD-2 operation for 645 is a Most Significant Bit (MSB).
3. The remainders of MOD-2 operation for 645 should be written from MSB to LSB to form the binary equivalent for the given decimal number (645)10.