# 少数や分数、計算式を英語で言い表す

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1.基本的な数字の表現
1-1。 小数
1-2。 分数
2.基本的な計算の表現
2-1。 4つの算術演算
2-2。 計算式の読み方
3.英語で数式を読むための演習

## 1. 基本の数の表現

1-1. 少数の表現 (decimals)

3.14159
Three-point-one-four-one-five-nine

16.28
Sixteen-point-two-eight

9.05
Nine-point-oh-five / Nine-point-zero-five

1の位が0だった場合は、省略してpointから言ってもOKです。

0.35
Zero-point-three-four / Point three-five

Round off to the second decimal place. / Round off to the nearest hundredths. / Round off to two decimal places.

Can you give me the numbers up to the second decimal place?

1-2. 分数の表現 (fractions)

3/5
Three-fifths / Three over five

6/20
Six-twentieths / Six over twenty

1/10
A tenth / One over ten

1/3
A third / One over three

5/4
Five-fourths / Five over four

1/2
A half

1/4
A quarter

3/4
Three quarters

## 2. 基本の計算の表現

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2-1. 四則演算

2 + 5 = 7
Two plus five equals seven. / Two plus five is seven.

6 – 3 = 3
Six minus three equals three. / Six minus three is three.

9 x 10 = 90
Nine times ten equals ninety. / Nine times ten is ninety.

50 ÷ 25 = 2
Fifty divided by twenty equals two. / Fifty divided by twenty is two.

-5 x 7 = -35
Negative five times seven equals negative thirty-five. / Negative five times seven is negative thirty-five.

a + n = x
a plus n equals x

2-2. 計算式の読み上げ例

xを割り出す時は、もちろんequal やisを使ってもいいのですが、ここではmust be (～のはず)という表現を使ってみましょう。

35 – x = 10 … x = 25
Thirty five minus x equals ten, so x must be twenty-five.

20 x 2/3 = n … n ≈　13
Twenty times two thirds equals n, so n must be approximately thirteen.

(5.05 + 12.30) x 30 = ? … 17.35 x 30 = 520.5
Five-point-oh-five plus twelve-point-three-oh is seventeen-point-three-five, and that times thirty is five-hundred-twenty-point-five.

## 3. 計算式を英語で読み上げる練習問題

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