This is the 2096th most frequent Japanese word.
増やし
"増やし" means "increase" or "to add more."
増やしました (fuyashimashita) - Here, it is used in the past tense to indicate that the speaker actively increased the quantity of books.
私は本の数を増やしました。
I increased the number of books.
増やす (fuyasu) - In this sentence, it is used in its base form to describe the act of making savings grow, highlighting its application in a general context.
貯金を増やすのは重要です。
Increasing savings is important.
増やそうとしています (fuyasou to shiteimasu) - Utilized in the volitional form followed by 'to shiteimasu', showing an effort to increase the number of friends.