UNIT X UNIT 2 | 75 Practice pronunciation Write the names of the place values on the board in two lists. Left: ones, tens, hundreds, thousands; Right: tenths, hundredths, thousandths. Point to the words as you say them aloud. Have students repeat after you. Listen closely for the th sound at the end of the fractional values. B Reinforce math vocabulary Review the process of writing decimals using different forms. Elicit from students that the first step is placing a value (hundredths, tenths, ones, tens, etc.) above each number. Students can reread the Place Value box. Students complete the activity individually, then discuss their answers with a partner. ANSWERS 1. twenty-seven and sixty-four hundredths; 2 × 10 + 7 × 1 + 6 × 1/ 10 + 4 × 1/ 100 2. eighty-six and five hundred thirty-one thousandths; 8 × 10 + 6 × 1 + 5 × 1/ 10 + 3 × 1/ 100 + 1 × 1/ 1,000 3. ninety-two and forty-five hundredths; 9 × 10 + 2 × 1 + 4 × 1/ 10 × 5 × 1/ 100 C Interpret data Look at the numbers in item 1. Elicit from students how they know which number is greater and which is less. Remind them to start by looking at the whole numbers. Students complete Activity C individually. ANSWERS 1. >; 2. >; 3. <; 4. >; 5. < D Order information Read the directions. Elicit from students the steps they will take to work through the task. Write the steps on the board for students to follow. Arrange students in groups of three or four to complete Activity D following the steps. ANSWERS From least to greatest: D (7.20), E (7.60), A (7.98), C (8.51), B (8.89) Practice Book p. 40 Assessment Program p. 30 FORMATIVE ASSESSMENT DIFFERENTIATED INSTRUCTION Scaffold • Remind students to follow the steps of figuring out place value to work out word form and expanded form of decimal numbers. • Guide students to look first at the whole number when comparing numbers. Explain that greater than and less than symbols are like crocodile mouths; they always face the greatest number because they are “hungry”. Amplify Have students come up with another group of five measurements expressed as decimal numbers. They exchange their numbers with a partner, and each goes through the process of arranging them from least to greatest. Write: Decimal Place Value Write the word form for the numbers in the left column of Activity C. Write the expanded form for the numbers in the right column of Activity C. PRACTICE COMMUNICATE B Word form and expanded form Write each number in word form and expanded form. 1. 27.64 2. 86.531 3. 92.45 C Compare numbers Use the greater than (>) or less than (<) symbols to complete the expressions. 1. 76.32 75.30 2. 4.60 4.06 3. 123 123.9 4. 0.57 0.075 5. 50.51 51.50 D Making connections Imagine that you find five mysterious spheres in the forest. You want to arrange them from lightest to heaviest. Look at the weight of each sphere. Arrange the spheres A–E on a number line. sphere weight (in pounds) A 7.98 B 8.89 C 8.51 D 7.20 E 7.60 75 UNIT 2 UNIT 2 / CONNECT TO MATHEMATICS
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