Lesson 3-1 Ideas/Vocabulary

• Represent decimals in word form, standard form, and expanded form.

• standard form

• expanded form

Lesson 3-1 TEKS

6.1 The student represents and uses rational numbers in a variety of equivalent forms. (B) Generate equivalent forms of rational numbers including whole numbers, fractions, and decimals.

Lesson 3-1 Example 1

Write 102.056 in word form.

Write a Decimal in Word Form

Answer: 102.056 is one hundred two and fifty-six thousandths.

Interactive Lab: Modeling Decimals

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Write 230.108 in word form.

A. two hundred thirty and one hundred eight tenths

B. two hundred thirty and one hundred eight hundredths

C. two hundred thirty and one hundred eight thousandths

D. two hundred thirty and one hundred eight ten-thousandths

Lesson 3-1 Example 2

Write seventy-six and one hundred three thousandths in standard form and in expanded form.

Answer: Standard form: 76.103

Expanded Form: (7 10) + (6 1) + (1 0.1) + (0 0.01) + (3 0.001)

Standard Form and Expanded Form

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Write fifty-nine and sixty-two thousandths in standard form and in expanded form.

A. 59.62; (5 10) + (9 1) + (6 0.1) + (2 0.01)

B. 59.062; (5 10) + (9 1) + (0 0.1) + (6 0.01) + (2 0.001) C. 59.0062; (5 10) + (9 1) + (0 0.1) + (0 0.01) + (6 0.001) + (2 0.0001)D. 59.6200; (5 10) + (9 1) + (6 0.1) + (2 0.01) + (0 0.001) + (0 0.0001)