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This website has great math resources by grade level & they are aligned to the Common Core

Why didn't I ever come up with this when I was in the classroom? Keep dice from flying/getting lost!

FREE 120 Chart ideas ... great to send home or use in a math center! From Ship Shape First Grade

Butterfly Fractions. Another way how to learn how to add and subtract fractions with unlike denominators.

Common Core State Standards for Mathematics

from Differentiated Kindergarten

Differentiated Math Stations . . . and a Freebie

Love her differentiated math centers...works for any grade level!

from The Wonder Years

Math Manipulatives, Links, and Printables

Number sense center

from Babble

25 More DIY Educational Activities for Kids

Lego Math - 25 More DIY Educational Activities for Kids...there are some really great ideas in here for preschool and early elementary!