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Decimal Fractions

Unit 15, Lesson 1, Day 1

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DPP B

If you have two numbers to multiply and you don’t know the answer, you can break one of the multiplies into two numbers and multiply, then add the two answers together.

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Essential Question

How does knowing and understanding that our number system is based on 1s, 10s and 100s help us do decimal fractions?

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Math Vocabulary

common fraction; fraction – any fraction that is written with a numerator and denominator that are whole numbers. For example, 3/4 and 9/4 are both common fractions.

decimal fraction; decimal – A fraction written as a decimal. For example, 0.75 and 9.4 are decimal fractions and 75/100 and 4/10 are called common fractions.

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Math Vocabulary

hundredth – there are one hundred hundredths in a one

tenth there are ten tenths in a one

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Essential Question

How are tenths and hundredths like tens and hundreds?

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Part 1The Flat as a Whole

We will now use the flat as one whole.

Before we used the bit as one whole.

Work with your group to answer the following questions:

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The Flat as a Whole

The flat is one whole. How many skinnies cover one flat?

If the flat is one whole, a skinny is what fraction of a flat?

Two skinnies are what fraction of one whole?

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The Flat as a Whole

Six skinnies are what fraction of the flat or one whole?

How many bits cover one flat?

If the flat is one whole, what fraction is one bit?

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The Flat as a Whole

What fraction is six bits?

What fraction is twenty-one bits?

How many bits make a skinny?

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Math Vocabulary Review

common fraction; fraction – any fraction that is written with a numerator and denominator that are whole numbers. For example, 3/4 and 9/4 are both common fractions.

decimal fraction; decimal – A fraction written as a decimal. For example, 0.75 and 9.4 are decimal fractions and 75/100 and 4/10 are called common fractions.

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Math Vocabulary Review

hundredth – there are one hundred hundredths in a one

tenth there are ten tenths in a one

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Essential Question Discussion

How are tenths and hundredths like tens and hundreds?