PBS
Pbs Learning Media: Teaching Tips: Deductive and Inductive Reasoning (1St Grade)
Use these teaching tips from the PBS Kids Lab to help children make sense of problems and persevere in solving them, determine the unknown whole number in an addition or subtraction equations, use addition and subtraction within 20 to...
CK-12 Foundation
Ck 12: Math Grade 1
Browse resources related to first-grade math standards. Click on a topic for interactive lessons, videos, and extra practice.
CK-12 Foundation
Ck 12: Math Grade 2
Browse resources related to second-grade math standards. Click on a topic for interactive lessons, videos, and extra practice.
NumberNut
Number Nut: Subtraction: Subtracting Through Twenty
Explains how to subtract numbers from twenty or less, with reference to using addition to find the difference.