factor

要因

結果を生むことに関わったり、判断に影響したりする要素の一つ。

やさしい英語で： One of the things that helps cause a result or influences a decision.

• Cost is an important factor.
• Poor weather was a major factor in the delay.
• Which factors affect your choice of school?

使い方： factor in something (Price was a factor in our decision.)

類義語： influence, element

よく使う表現： important factor, risk factor, major factor, key factor

因数、約数

掛け合わせてある数を作る数、またはある数を割り切れる数。

やさしい英語で： A number that is multiplied by another to give a result, or divides another number exactly.

• Two is a factor of six.
• Find all the factors of twenty.
• These two numbers have a common factor.

使い方： factor of something (Three is a factor of twelve.)

類義語： divisor

よく使う表現： prime factor, common factor, factor of something

因数分解する

掛け合わせると元の数や式になる、数や式の組み合わせに分ける。

やさしい英語で： To find the numbers or mathematical parts that multiply together to make a given number or expression.

• Can you factor this number?
• We factored the expression in algebra class.
• Factor eighteen into prime numbers.

使い方： factor something into something (We factored twelve into two, two, and three.)

類義語： factorize

よく使う表現： factor a number, factor an expression, factor into primes