Compare: 思う vs 考える

思うおもう

to think; to consider; to believe; to reckon

考えるかんがえる

to think (about, of); to think over; to ponder; to contemplate; to reflect (on); to meditate (on)

おもう思う

N5CommonGodan verb (u ending)

to think; to consider; to believe; to reckon

彼(かれ)は思ったことを口にする。

He's a plain speaker.

電話で済まそうと思いました。

I thought I could settle it by phone.

かんがえる考える

N5CommonIchidan verb

to think (about, of); to think over; to ponder; to contemplate; to reflect (on); to meditate (on)

「何を考えてるの？」「別に・・・」

"What are you thinking about?" "Nothin'..."

そんなことを考えながら『我輩はカモである』を再見(さいけん)しました。

Thinking about those sorts of things, I watched "Duck Soup" again.