4. Fill in the blanks:a.$\frac{1}{4}$ century = .... ... ... years ...

Cách làm:

a. $\frac{1}{4}$ Century = 25 years (1 century = 100 years, so $\frac{1}{4}$ century = $\frac{1}{4} \times 100 = 25$ years)

b. $\frac{1}{5}$ Century = 20 years (1 century = 100 years, so $\frac{1}{5}$ century = $\frac{1}{5} \times 100 = 20$ years)

c. $\frac{1}{3}$ Minute = 20 seconds (1 minute = 60 seconds, so $\frac{1}{3}$ minute = $\frac{1}{3} \times 60 = 20$ seconds)

d. $\frac{1}{10}$ Hour = 360 seconds (1 hour = 60 minutes = 60 x 60 seconds, so $\frac{1}{10}$ hour = $\frac{1}{10} \times 60 \times 60 = 360$ seconds)

Đáp án:

a. 25 years

b. 20 years

c. 20 seconds

d. 360 seconds