Transcript Dazzling Decimals - Ms. McGuirk's 6th Grade Science Class

Dazzling Decimals
February 17, 2011
Dazzling Decimals
• Agenda
–Review Decimal Place Value
–Compare Decimals
–Add and Subtract Decimals
Ground Rules
• You will follow all existing classroom procedures.
• When you see this icon,
you
you will
write in your index spiral.
• When you see, “Let’s Go!,” you will clap and say
“Calculate” at the same time.
• You will not take the folder or index spiral out of
your homeroom.
• Your index spiral and folder will become one of
your study guides for TCAP.
Let’s Review the Place Value!
2
hundreds
7
tens
3
ones
4
4/10
5
5/100
tenth hund
s
redth
s
decimal point
1
9
What What’s
’s
next?
next?
Let’s Go!
Did You Answer Correctly?
2
7
3
4
5
1
9
hun te on 4/10 5/100 1/1000 9/10,0
dred ns es tenth hund Tho 00
s
redt usan Ten
s
dths Thou
hs
sandt
hs
You have 3 minutes to copy.
Comparing Decimals
Numbers to the right of the decimal point are
smaller than numbers to the left.
Larger Numbers
Smaller Numbers
Let’s Investigate!
Tenths Place- Takes
this ones cube and
divides it evenly 10
times.
Hundredths PlaceTakes this ones cube
and divides it evenly
100 times.
Thousandths PlaceTakes this ones cube
and divides it evenly
1000 times.
Which is greater:
0.6 or 0.58 ?
0.60
0.58
0.6 > 0.58
Hint: One trick
is to add a zero
to the end of
the number so
that both
numbers are
balanced. Then
select the
higher value.
Which is greater:
0.6 or 0.58
0.6
0.58
Let’s Investigate!
Place this on the back of your index card
Write down these numbers.
1.045
0.0456
2.05
246
0.04557
.0456
Answer these questions:
What number is the largest?
• 246
What number is the smallest?
• 0.04557
What numbers are equal?
• 0.0456 = .0456
Let’s Go!
✔For Understanding
• Go to your handout and
complete the comparing
decimals questions 1-10. You
will have 5 minutes.
Let’s Check
• Your teacher will write the correct answers on
the board. Please check your work.
• How many of you got 100%?
• How many of you got 1 wrong?
• How many of you got 2 wrong?
• How many of you got 3 or more wrong?
You have 3 minutes to copy.
Adding and Subtracting Decimals
Step 1: Line up the decimal points of each
number.
Step 2: Line up the place values.
Step 3: Add or subtract from right to left.
Regroup/borrow when necessary.
Place this on the back of your index card.
Line up the
Line up the
decimal points. decimal points.
22.3
+ 34.1
56.4
97.568
- 38.123
59.445
✔For Understanding
• Go to your handout and
complete the Lesson Practicepage 14 (1-8). You will have 12
minutes. Please show your
work on the back of the paper.
Let’s Check
• Your teacher will write the correct answers on
the board. Please check your work.
• How many of you got 100%?
• How many of you got 1 wrong?
• How many of you got 2 wrong?
• How many of you got 3 or more wrong?
Exit Ticket
1. Take out your computer.
2. Log onto
http://www.quia.com/profiles/ylewis26
3. Take the Exit Ticket Quiz titled
February 17, 2011_ Decimals Exit Ticket
secret word: dazzle
4. There are other activities on this Quia Web site to
practice your decimals.