Science Lab Beakers: Renaming and Adding Tenths and Hundredths

Change tenths to hundredths, then add.

Tenths to Hundredths

Each tenth is the same as 10 hundredths. Write the missing numbers.

Ana's beaker is marked in tenths of a liter. She pours in 4/10 of a liter of water.

4/10 = /100

Mr. Okafor fills a flask with 7/10 of a liter of salt water.

7/10 = /100

A test tube holds 50/100 of a liter of colored water. How many tenths of a liter is that?

/10 = 50/100

Each lab group measures some vinegar. Match each amount in tenths to the same amount in hundredths.

Which fraction is equal to 3/10?

A. 3/100B. 13/100C. 30/10D. 30/100

Mixing in the Lab

Rename the tenths as hundredths. Then add.

Leo pours 3/10 of a liter of red water and 45/100 of a liter of blue water into one big beaker. How much water is in the big beaker?

3/10 + 45/100 = /100 + 45/100 = /100 of a liter

Grace scoops 6/10 of a kilogram of sand and 8/100 of a kilogram of small pebbles into a tray. How much do they weigh together?

6/10 + 8/100 = /100 of a kilogram

Hiro measures 12/100 of a liter of lemon juice and 5/10 of a liter of water for a test.

12/100 + 5/10 = /100 of a liter

On the lab scale, a rock weighs 2/10 of a kilogram and a seashell weighs 37/100 of a kilogram. How much do they weigh together?

2/10 + 37/100 = /100 of a kilogram

10.

The class needs exactly 80/100 of a liter of water for an experiment. Sort each pair of beakers by whether the two amounts add up to exactly 80/100 of a liter.

Lab Check

Find the mistake and explain your thinking.

11.

Mia adds 4/10 + 25/100 and writes 29/100. What mistake did she make?

A. She added the denominators.B. She should have subtracted.C. She did not rename 4/10 as 40/100 before adding.D. She made no mistake.

12.

Deshawn pours 9/10 of a liter of water into a tank. Then he adds 6/100 of a liter more. Explain how to find the total, and write the sum as a fraction with denominator 100.