Post on 11-Jan-2016
transcript
Math 5Read, write decimals to
the thousandths
Instructor: Mrs. Tew Turner
In this lesson you will learn about place value with
decimals and the patterns that we find in the base 10
system.
1 Minute Math Warm-up!
a) 17 + 12= b) 21 + 37=c) 36 + 23=d) 54 + 45=e) 13 + 9 =f) 29 + 11=g) 64 + 18=h) 73 + 37= http://timer.onlineclock.net/
Math Warm-up
a) 17 + 12= 39b) 21 + 37= 58c) 36 + 23= 59d) 54 + 45= 99e) 13 + 9 = 22f) 29 + 11= 40g) 64 + 18= 82h) 73 + 37= 110
Decimal place value is very similar to whole number place value.
Every number has a place to hold.
However, decimals are numbers LESS than ONE
WHOLE number otherwise known as a FRACTION.
All numbers that are decimals end with a “ths”
to represent a number that is less than one or a
fraction.
1 Whole
Tenths
Hundredths
Thousandths
“AND”: How you SAY the DECIMAL POINT.
Decimal numbers always represent LESS THAN ONE!
Let’s Practice reading decimal numbers!
1)1.982You say, “One AND Nine hundred eighty two thousandths.”
Let’s Practice reading decimal numbers!
2) 456.367You say, “Four hundred fifty six AND three hundred sixty seven thousandths.”
Let’s Practice reading decimal numbers!
3) 4,687.97You say, “Four thousand, six hundred eighty seven and ninety seven hundredths.”
Now lets work on recognizing and saying these numbers. Why are they less than one?
0.3 = Three Tenths = this means you have 3 out of 10 items = 3/100.04 = Four Hundredths = this means you have 4 out of 100 items = 4/100
DrawThe symbolfor ONES,Tenths,Hundredths, &Thousandths.
Make a chart like this in your notebook
Let’s look at an example:
Thousands
Hundreds
Ones Decimal
Tenths Hundredths
Thousandths
9 4 2 . 7 3 9
Let’s read this number together.
Now let’s PracticeWe will look at the number, say the number, then say the fraction.
0.45
Forty-five HUNDREDTHS
45/100
0.07
Seven HUNDREDTHS
7/100
0.9
Nine TENTHS
9/10
0.306
Three Hundred-six THOUSANDTHS
306/1000
0.791Seven Hundred Ninety-one THOUSANDTHS
791/1000
0.041
Forty-one THOUSANDTHS
41/1000
0.009
Nine THOUSANDTHS
9/1000
Quick CheckWrite each number in standard
Form:
1) 60 + 0.6 + 0.03 + 0.007 + 8
Hundreds
Tens Ones Decimal
Tenths Hundredths
Thousandths
.
Quick CheckWrite each number in standard
Form:
1) 60 + 0.6 + 0.03 + 0.007 + 8
Hundreds
Tens Ones Decimal
Tenths Hundredths
Thousandths
6 8 . 6 3 7
Quick CheckWrite each number in standard
Form:
2) Four and sixty-eight hundredths
Thousands
Hundreds
Ones Decimal
Tenths Hundredths
Thousandths
.
Quick CheckWrite each number in standard
Form:
2) Four and sixty-eight hundredths
Hundreds
Tens Ones Decimal
Tenths Hundredths
Thousandths
4 . 6 8
Quick CheckGive the VALUE of the underlined
digit:
3) 4.737 Hundreds
Tens Ones Decimal
Tenths Hundredths
Thousandths
.
Quick CheckGive the VALUE of the underlined
digit:
3) 4.737 Hundreds
Tens Ones Decimal
Tenths Hundredths
Thousandths
4 . 7 3 7
In your Math NotebookExplain how the number 3.453 has two 3’s. Why does each 3
have a different value? Hundreds
Tens Ones
Decimal
Tenths
Hundredths
Thousandths
.
In your Math NotebookExplain how the number 3.453 has two 3’s. Why does each 3
have a different value? Hundreds
Tens Ones
Decimal
Tenths
Hundredths
Thousandths
3 . 4 5 3
Explain how the number 3.453 has two 3’s. Why does each 3 have a different value?
The first 3 on the far left is a WHOLE number.
The 3 on the far right represents the THOUSANDTHS place or a fraction:
3/1000:
In your Math Notebook-guide
Continued explanation:
The models show the value of the digit 3 in each of the different places it appears in the number 3.453. Thousandths SOUND LARGE but they are only slivers of a whole number. They are VERY SMALL!
In your Math Notebook-guide
http://tinyurl.com/33xep6y
Scooter Quest
Today you learned how to read and write decimals to the thousandths
Good Work with this
lesson.