Subtraction
noun
What's a method to decrease something? Well, you take something away. You do subtraction.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Note that the ほう changes to ぽう. This is because you're trying to subtract Polar (ぽう) bears from the area around you as they're very dangerous and you use a cologne made from meat.
私は数学者で、大学で数学の減法を研究しています。
I am a mathematician and am studying mathematical subtraction in college.
物理の問題で、ベクトル減法はあまり見ませんが、たまに出てくることがあります。
In physics problems, we don’t come across vector subtraction very often, but it does pop up sometimes.
先日、加法をマスターしたので今日からは減法を学びます。
I mastered addition the other day, so I will start learning subtraction today.