Add/Subtract Decimals

-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 Decimals2 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 AcademySal solves 9.087+15.31 using the "standard algorithm".

Adding decimals: 0.822+5.65 (video) | Khan AcademySal solves 0.822+5.65 using "standard algorithm".

Subtracting decimals: 9.005 - 3.6 (video) | Khan AcademyJust like when add, be sure you align decimals before subtracting.

Subtracting decimals: 39.1 - 0.794 (video) | Khan AcademyIn 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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