25°12′36″=____ ° How do you calculate it,

25°12′36″=____ ° How do you calculate it,

First, convert 36 seconds into components, 36 △ 60 = 0.6 minutes
That is 36 "= 0.6 '
12+0.6=12.6'
Then convert 12.6 'to degree
12.6÷60=0.21
That is 12.6 '= 0.21 degree
25+0.21=25.21
So 25 ° 12 ′ 36 ″ = 25.21 ″

1=（ ）= 7 = （ ） 0.75= 15 =（ ）=15÷（ ） （ ）（ ）（12） （ ） 36
1 = how many parts = how many parts 7 = how many parts 12? 0.75 = how many parts 15 = how many parts 36 = 15 ^ ()

What's the topic of primary school mathematics? 1 = x / x = 7 / 7 = 12 / 12 0.75 = 15 of 20 = 36 of 48 = 15 △ 20
I don't understand your topic at all