Teaching the Common Core Math Standards With Hands-On Activities, Grades 3-5 (61 page)

5.
Encourage your students to be creative, but remind them that they must be mathematically accurate.

Closure

Have each group share their poster with the class. During sharing, review place value and patterns in the placement of the decimal point when multiplying or dividing by powers of 10. Display the posters.

Number and Operations in Base Ten: 5.NBT.3

“Understand the place value system.”

3. “Read, write, and compare decimals to thousandths.

a.
“Read and write decimals to thousandths using base-ten numerals, number names, and expanded form.

b.
“Compare two decimals to thousandths based on meanings of the digits in each place, using
and
symbols to record the results of comparisons.”

Background

Numbers can be expressed in words or numerals. When numbers are expressed in words, they are named according to place value. For example, the number 342 is written as “three hundred forty-two”; 23.5 is written as “twenty-three and five tenths.”

Numbers can also be written in expanded form, which is the sum of the values of each digit of the number. In expanded form, the number 7,259.6 is written as
.

Activity: Creating Numbers

Students will write numbers from clues in which numbers are written using base-ten numerals, number names, and expanded form. They will then compare the numbers using
and

Materials

Scissors; glue sticks; one sheet of construction paper; reproducible, “Number Clues,” for each student.

Procedure

1.
Review place value, with emphasis on writing and reading numbers. Offer some examples, such as the following:

• 2.6 is read “two and six tenths.” Note that when writing decimals the word “and” represents the decimal point.
  
• 17.41 is read “seventeen and forty-one hundredths.”
  
• 0.078 is read “seventy-eight thousandths.”
  

2.
Explain that expanded form is written as the sum of the parts of a number. Provide a few examples, such as the following:

3.
Hand out copies of the reproducible. Explain that it contains six rows of clues. Students will use the clues in each row to write a number. Note that the clues are not arranged in order according to place value.

4.
Explain that students are to cut out the clues in each row. Caution them to cut out and work with one row at a time so as not to mix up the clues from different rows. They are to arrange the clues in order, according to place value, revealing a number. Students are to glue the clues on their construction paper in the correct order, and then write the number after each clue.

5.
Explain that after students have written the number for each row, they are to write statements of comparison, as shown on the bottom of the reproducible.