Transcript Round Decimals - Teacher Pages

5-Minute Check
 Compare. Write >, <, or =.
6
7 3/10
 5.6
5
 2 1/10
2.1
 4.7
4.07
By Mr. Bales
Objective
 By the end of the lesson, you will be able to
round decimals.
 Standard 4NS2.2 – Students will be able to
round two-place decimals to one decimal place
or the nearest whole number and judge the
reasonableness of the rounded answer.
Introduce
 Let’s review rounding with a famous song:
 When the digit to the right is 5 or greater, do you round
up or down?
 What do you do when the digit is less than 5?
 Round the numbers to the nearest ten:
 19
 25
 Round to the nearest hundred:
 195
 249
Teach
 Look at this decimal: 2.61
 What number is in the tenths place value?
Hundredths? Ones?
 What is the value of the digit in the ones place?
 How could you round 2.61 to the nearest whole
number?
 How could you use the 1 digit in the hundredths
place to help you round 2.61 to the nearest tenth?
Get Ready to Learn
 Death Valley is a
national park in
California. Death
Valley has 3.37 million
acres of land. What is
3.37 rounded to the
nearest whole number?
Rounding Decimals
 One Way: Use a
number line
 Another Way: Use
Rounding Rules
 3.37
 Underline the digit to
be rounded. In this
case it is the 3 in the
ones place.
 Then, look at the difit
to the right. Since 3
is less than 5, the
Bales Bucks!!
 Round to the nearest whole number.
 3.24
 9.87
 36.61
 83.14
 Round to the nearest tenth.
 4.13
 8.45
 25.94
 67.28
Assignment
 Page 595- #’s 11-28
 Get them all correct - No Math Homework (over the
weekend)