Happy Numbers is a terrific math web app that is designed to help elementary school students understand foundational concepts. They have tons of great activities for teachers to use with their students and have just released a new update. Their new topic Plus-Minus 1-100 (part 2), is designed to help students understand the concept of regrouping and exchanging.
K-2 Math Exercises
This exercise gives students an opportunity to work though two-digit addition and subtraction problems using visual models they can move across their screen. Using a variety of objects like apples and base ten blocks, students will begin to understand the relationship between place value and operations. Students will also have the opportunity to use a number line to model addition and subtraction with two-digit numbers.
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Yours in Learning, Monica :)