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5th Grade Math
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INTO MATH SUPPORT
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5th Grade Math
Add/Subtract Decimals
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Adding and Subtracting Fractions
-For PLACE VALUE SUPPORT:
https://sites.google.com/nscsd.org/5thgrademath/place-value
Strategies:
line up the decimals
use a place value chart
use graph paper or lined paper
Anchor charts/Notes -
Add and subtract decimals
PLACE Value with Decimals
2 5 4 3 7 8 Standard (number) form: 254.378 Written (word) form: two hundred fifty-four and three hundred seventy-eight thousandths Expanded form: (2 x 100) + (5 x 10) + (4 x 1) + (3 x .1) + (7 x .01) + (8 x .001) -----> Using Decimals OR (2 x 100) + (5 x 10) + (4 x 1) + (3 x 1/10) + (7 x 1/100) ...
VIDEOS on adding and subtracting decimals
Adding decimals: 9.087+15.31 (video) | Khan Academy
Sal solves 9.087+15.31 using the "standard algorithm".
Adding decimals: 0.822+5.65 (video) | Khan Academy
Sal solves 0.822+5.65 using "standard algorithm".Â
Subtracting decimals: 9.005 - 3.6 (video) | Khan Academy
Just like when add, be sure you align decimals before subtracting.
Subtracting decimals: 39.1 - 0.794 (video) | Khan Academy
In this example where we subtract decimals we do so up to the thousandths place. It's a little tricky, but not if we do it together.
www.ixl.com/math/lessons/adding-decimals
www.ixl.com/math/lessons/subtracting-decimals
<------These are on IXL - use these links or log in through launchpad, go to IXL and follow the link...
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