2.1 Understand and use the inverse relationship between addition and subtraction.
2.2 Find the sum or difference of two whole numbers up to 3-digits long.
2.3 Use mental arithmetic to find the sum or difference of two two-digit numbers.
Ten Frames
Ten Frame - NCTM |
Addition
How Many Under the Shell? - practice addition or subtraction
That's a Fact- practice addition facts to 20
Add and subtract to move the ball along the numberline to smash the bugs.
DoublesDoubles - ICT Games
Add Doubles to 20 - Math Playground worksheet
Add Doubles to 20 - Math Fact Cafe
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Subtraction
That's a Fact! - practice subtraction facts to 20
Busy Bees - Figure out how many bees flew into the hive!
How Many Under the Shell? - practice addition or subtraction
Subtraction Sense - drag the numbers to make a subtraction problem
High Rise Math - Play this game with a partner and see who makes it to the top first.
Add and subtract to move the ball along the numberline to smash the bugs.
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Advanced Addition and Subtraction
Presentation
Adding and Subtracting Whole Numbers with Four Digits - Nutshell Math
Practice
Drag and Drop Math - Mr. Nussbaum |
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difference of two two-digit numbers.