Answer:
100110
Explanation:
You keep dividing by 2 until you get to 0 and keep track of the remainder.
There will either be a remainder of 1, or no remainder. When there is no remainder, write 0.
38 ÷ 2 = 19 r 0
19 ÷ 2 = 9 r 1
9 ÷ 2 = 4 r 1
4 ÷ 2 = 2 r 0
2 ÷ 2 = 1 r 0
1 ÷ 2 = 0 r 1
Answer is read from bottom to top, so 38 converted to base two is 100110.