トムは計算が正確です。

とむは計算が正確です。

Tom is accurate at figures.

トムは計算(けいさん)が正確(せいかく)です。

Tomu wa keisan ga seikaku desu.

富む (とむ)

to be rich; to become rich; to be abundant (with); to abound (with); to be rich (in)

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

正確 (せいかく)

accurate; punctual; exact; authentic; veracious

です (です)

be; is

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: セイ、ショウ、ただ.しい、ただ.す、まさ、まさ.に

Meanings: correct, justice, righteous, 10**40

Readings: カク、コウ、たし.か、たし.かめる

Meanings: assurance, firm, tight, hard, solid, confirm, clear, evident