Math story problems with character and setting cards
Math centers and printables - tons of ideas & resources on this blog.
Lots of great sites to use for Measurement unit
WOW! What a resource this is! You can choose any grade level first through fifth (great for differentiation) and get LOTS of different worksheets for math skills by grade level. Keep this one handy!!
Could do something similar for integrated science and defining the variables for power, velocity etc.
Math center activity
Roll two dice and find the sums. Nice recording sheet with clear directions.
Student Teaching Ideas
Quick and Easy Math activity for getting to know numbers
A huge list of books that can be integrated into math lessons! The list is even divided by math topic.
Lipstick, Lattes, and Lesson Plans: Managing Guided Math (Math Workshop)
Grade 1 teaching ideas