There are 2 methods:

(A) Revese of Binary-To-Digital Method

Decimal 45 = 32 + 0 + 8 + 4 +0 + 1

= 25+0+23+22+0+20
= 1 0 1 1 0 1 (binary)

(B) Repeat Division

This method uses repeated division by 2. Eg. convert 2510 to binary

25/ 2 = 12+ remainder of 1 1 (Least Significant Bit)

12/ 2 = 6 + remainder of 0 0
6 / 2 = 3 + remainder of 0 0

3 / 2 = 1 + remainder of 1 1

1 / 2 = 0 + remainder of 1 1 (Most Significant Bit)

Result Decimal 2510 = 1 1 0 0 1 (binary)

The Flow chart for repeated-division method is as follow:

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