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The calculation of seventh grade mathematics angle: how to add, subtract, multiply and divide quickly in speed, minute and second.
1 degree =60 points

1 min =60 seconds

take for example

35.42 degrees =35 degrees +0.42 degrees. Multiplying 0.42 degrees by 60 becomes 0.42*60= 25.2 points.

0.2 points multiplied by 60, converted into seconds is 0.2 *60= 12 seconds.

So 35.42 degrees =35 degrees 25 minutes 12 seconds.

On the contrary, use division.

12s/60 = 0.2min.

25.2 minutes /60=0.42 degrees