彼は計算が得意だ。

彼は計算が得意だ。

He's good at arithmetic.

彼(かれ)は計算(けいさん)が得意(とくい)だ。

Kare wa keisan ga tokui da.

彼 (かれ)

he; him; his; boyfriend

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

計算 (けいさん)

calculation; reckoning; count; forecast

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

得意 (とくい)

triumph; prosperity; pride; one's strong point; one's forte; one's specialty; frequent customer (client, etc.)

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: ケイ、はか.る、はか.らう

Meanings: plot, plan, scheme, measure

Readings: サン、そろ

Meanings: calculate, divining, number, abacus, probability

Readings: トク、え.る、う.る

Meanings: gain, get, find, earn, acquire, can, may, able to, profit, advantage, benefit

Reading: イ

Meanings: idea, mind, heart, taste, thought, desire, care, liking