数、数式の英語

◎4＋3＝7
Four plus three equals seven.
Four and three is seven.
Four and three makes seven.
Four and three make seven.

◎9－5＝4
Nine minus five equals four.
Nine take away five is four.

◎8×7＝56
Eight multiplied by seven equals fifty-six.
Eight times seven is fifty-six.
Eight sevens is fifty-six.

◎12÷4＝3
Twelve divided by four equals three.
Twelve divided by four is three.
Four into twelve goes three.

◎10÷3＝3･･･1
Ten divided by three is three with a remainder of one.

☆分数 → fraction
☆分子 → numerator
☆分母 → denominator

◎1/2
one half
one over two

◎1/4
a quarter
one fourth

◎1/5
one fifth

◎2/3
two thirds
two over three

◎3/4
three quarters
three over four

◎3/5
three fifths

◎2/3mile
two thirds of a mile

◎3/4hour
three quarters of an hour

☆帯分数 → mixed number

◎２ 1/2
two and a half

◎１ 3/4
one and three quarters

☆仮分数 → improper fraction

◎7/5
seven fifths

分子は数字で、分母は序数で読みます。
また”over”を使うこともできます。

◎24/5=4.8 → Twenty-four over five equals (is) four point eight.

☆逆数 → reciprocal

☆The reciprocal of three is one third.
3の逆数は1/3です

☆小数 → decimal

◎1.25
one point two five

◎0.35
point three five

☆循環小数 → recurring decimal
◎1.333…
one point three, three, three…

☆正の数 → positive numbers
◎+5
plus five (positive five)

☆負の数 → negative numbers
◎-5
minus five (negative five)

positive、negativeは数式で用いられます。

☆比率 → ratio
☆比例 → proportion
☆反比例 → inverse proportion
☆約 → about，approximately

◎3：2
three to two

◎五分五分
fifty-fifty

◎十中八九
nine cases out of ten

◎xはyに比例している
x is proportional to y.

◎xはyに反比例している。
x is inversely proportional to y.

◎xは約5である
x is nearly equal to 5.

☆指数 → exponent

◎2²＝4
Two squared is four.

◎2³＝8
Two cubed is eight.

◎2の4乗＝16
Two to the fourth power is sixteen.
Two to the power of four is sixteen.

◎2の5乗＝32
Two to the fifth power is thirty-two.
Two to the power of five is thirty-two.

◎A＞1
A is greater than one.

◎B＜5
B is less than five.

◎A+3＞B+4
A plus three is greater than B plus four.

◎一つにつき300円
three hundred yen each

◎1時間につき7000円
seven thousand yen per hour
seven thousand yen an hour

◎10人につき1人
one in ten

◎500円につき7個
seven for five hundred yen

一（1） one
十（10） ten
百（100） a hundred
千（1,000） a thousand
万（10,000） ten thousand
十万（100,000） a hundred thousand
百万（1,000,000） a million
千万（10,000,000） ten million
一億（100,000,000） a hundred million
十億（1,000,000,000） a billion
百億（10,000,000,000） ten billion
千億（100,000,000,000） a hundred billion
一兆（1,000,000,000,000） a trillion
十兆（10,000,000,000,000） ten trillion
百兆（100,000,000,000,000） a hundred trillion

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