Transcript Decimal Notes

MATH MANIPULATIVE EXERCISE
• Everyone make sure you grab 5 square
blocks, 10 strips, and 10 small blocks!
• You will create the following numbers in your table
groups with the math manipulative blocks.
• You will be working as a group, a team, a close-knit
circle – you are not done until everyone in your group
understands why you have used the blocks you’ve
used!
17.92
• Make sure you are using the proper blocks
to represent each part of the number!
21.09
• Is it possible to create this number?
• You may have to think about how are you
going to use your tenths blocks!
2.98
• Make sure you are using the proper blocks
to represent each part of the number!
0.01
• Make sure you are using the proper blocks
to represent each part of the number!
0.396
• For this problem: treat the large square
blocks as tenths and go from there!
• Make sure you are using the proper blocks
to represent each part of the number!
0.056
• For this problem: treat the large square
blocks as tenths and go from there!
• Make sure you are using the proper blocks
to represent each part of the number!
0.307
• For this problem: treat the large square
blocks as tenths and go from there!
• Make sure you are using the proper blocks
to represent each part of the number!
ADDING AND SUBTRACTING DECIMALS
• Adding and subtracting decimals works the exact
same as regular addition and subtraction – you
just need to make sure you are lining up the
tenths, hundredth, thousandths, etc.
• If you are adding together hundredths and it
comes to over ten, you carry the 1 up to the
tenths place
• If you were subtracting 9 thousandths away from
4 thousandths, you’d have to break down the
hundredths and carry over the 1 from there.
LET’S PRACTICE!
• With your blocks – create the number 1.15
• Now with the blocks – add 0.5 to the original set
• How many do you have now?
• If you count them all up, you’ll see that you should have
one large block, six tenths blocks, and five hundredths
blocks to create the number 1.65
ADDITION
With your blocks please add the following numbers:
• 2.34 + 1.1
• 0.9 + 3.12
• 4.01 + 0.06
• 1.1 + 0.89
SUBTRACTION
With your blocks could you please subtract the
following numbers
• 2.34 - 1.1
• 3.12 - 0.9
• 4.11 - 0.06
• 1.19 - 0.89
PULL OUT A PIECE OF PAPER!
Please write Decimal Assessment as
the title as well as write your name
and the date!
DECIMAL ASSESSMENT
GREATER, LESSER, OR EQUAL?
ADDITION/SUBTRACTION
1. 19.09
19.092
6. 1.01 + 1.3
2. 14.693
14.396
7. 1.9 + 0.1
3. 8.010
8.01
8. 4.78 – 1.1
4. 3.5879
5.001
9. 4.05 + 1.95
5. 16.9
16.899
10. 2.99 + .33
GREATER, LESSER, OR EQUAL?
1. 19.09
< 19.092
ADDITION/SUBTRACTION
6. 1.01 + 1.3 = 2.31
2. 14.693 > 14.396
7. 1.9 + 0.1
= 2.0
3. 8.010 = 8.01
8. 4.78 – 1.1
= 3.68
4. 3.5879 < 5.001
5. 16.9
> 16.899
9. 4.05 + 1.95 = 6.00
10. 2.99 + .33
= 3.32
ROUNDING DECIMALS
• Now clearly mathematicians ALWAYS do everything the
easy way and rounding is no exception!
• When you look at a number with a decimal and you are
checking to see if it should be rounded up or down,
there are a few ways you can look at it!
1. If the number ends in 1, 2, 3, or 4 you will round
DOWN!
2. If the number ends in 5, 6, 7, 8, or 9 you will round
UP!
ROUNDING DECIMALS
• We can also look at this using the manipulatives…
• Create the number 1.3 with your blocks!
• Now if we wanted to round it to the nearest whole
number (left side of the decimal point!) we have to
ask…
• Is it easier to take away those 3 tenths blocks or is it
easier to find, pick out, and place 7 more blocks?
• Unless you’re super strong like Mr. Bristow, taking the 3
blocks away is the easiest thing to do!
• We ROUND DOWN!
PULL OUT A PIECE OF PAPER!
Please write Rounding Decimals
Practice as the title as well as write
your name and the date!
ROUNDING DECIMALS PRACTICE
• Write these numbers
and practice rounding
them up or down and
write the answers down
• Do you think you can
round these numbers to
the nearest tenth? Write
the answers down
• 1.4
• 1.44
• 2.5
• 2.58
• 1.6
• 1.61
• 0.7
• 0.75
• 0.1
• 0.16
• 1.4
• 1.45
TEXTBOOKS? WHAT ARE
THOSE?
• It is time to wail and gnash your teeth Oh Students of
ASIA Sumas as we finally have to crack open our
textbooks and work!
• Homework is pg 129-130 #1, 2, 3 a,c,e,g; 4, 6, and 9
• This will be checked Friday, December 4 th!
• If you get stuck, move to the next question and go back
to finish it later!