Practice making groups of 10 and 100 while adding 3-digit numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Second graders often become confused as they count from one decade to the next. In order to become fluent with operations in addition and subtraction, 2nd graders need to be able to move across decades. This instructional activity...

Browse resources related to second-grade math standards. Click on a topic for interactive lessons, videos, and extra practice.

This site is a lesson on the cardinal numbers 31-1000 with an explanation of how to change the hundreds to match the nouns they modify.A quiz follows the lesson to test the student's comprehension of these cardinal numbers.