&Basic mathematics

* be equal to = … equal…

operator *

1A. … equals A multiplied by B…

Momentum equals mass multiplied by velocity.

相乘的表示只能是 A multiplied by B, 不可以 A multiplied B。

1B. multiply the two numbers…

I can multiply large numbers in his head.

operator /

2. … be equal to A divided by B…

current is equal to voltage divided by resistance.

operator -

3. … equals B minus A …

Profit equals income minus expenditure.

operator +

4. The sum of … is…

The sum of the angles of any triangles is 180 degrees.

5. … is added …

I found that my bill was added incorrectly.

 

& Multiples

1A. … double …

The price of oil has doubled in less than 2 years.

1B. … be twice as large as …

The new school library will be twice as large as the old one.

1C. … has more than tripled …

His fortune has more than tripled in past six months.

1D. … be about five times bigger than …

Her new house is about five times bigger than her old one.

 

& percentages

1. XX percentage of

He decided to invest 30 percent of his savings in the stock market.

She spend over 50 percent of her time conducting research.

2. rise by XX %

Our company’s earnings rose by 10% this quarter.