Aquarium Visit: Tenths and Hundredths as Decimals

Write fractions with denominators 10 and 100 as decimals.

Tenths at the tanks

Write each fraction as a decimal, or fill in the missing number.

A baby sea turtle is 3/10 meter long.

3/10 = meter

Mr. Ortiz is cleaning the 10 equal panels of the big window. The shaded panels are clean.

The clean part of the window as a decimal:

Rocks and plants fill 0.4 of the octopus tank.

0.4 = /10

The number line from 0 to 1 is split into 10 equal parts. The dot shows how many miles the class walked along the harbor path to the aquarium.

The class walked mile.

The dolphin pool is 3 and 8/10 meters deep. Write the depth as a decimal.

3 8/10 = meters

Hundredths at the touch pool

Use what you know about hundredths to answer each question.

A sea star in the touch pool is 25/100 meter across.

25/100 = meter

A young seahorse grew 6/100 inch in one week. Which decimal is equal to 6/100?

A. 0.6B. 6.0C. 0.06

Ana's scoop of fish food weighs 0.83 ounce.

0.83 = /100

A postcard at the aquarium shop costs 75/100 of a dollar. Write the cost as a decimal.

10.

Each fish tag shows a fraction. Match each fraction to its decimal.

Think like a scientist

Sort, choose, and explain.

11.

The jellyfish tank is 0.3 full of water. Sort each number: is it equal to 0.3 or not?

12.

Ravi says 0.7 and 0.07 are the same number because both have a 7. Which statement is true?

A. Ravi is right. The two numbers are equal.B. They are not equal. 0.7 is 7 tenths and 0.07 is 7 hundredths.C. They are not equal. 0.07 is greater because it has more digits.

13.

A clownfish is 0.09 meter long. Write 0.09 as a fraction. Explain how you know.