Subtract within 1,000 (regrouping limited to only one place-value).
Understand why the standard algorithm for subtraction is based on place-value.
Understand that when subtracting a multi-digit number, each place-value is being subtracted individually to create the new number (ones are subtracted from ones, tens are subtracted from tens, etc.)
Understand how to regroup based on place-value understandings (i.e., ten ones can be composed into one ten – ten tens can be composed into one hundred).
Understand that subtraction equations can be written both vertically and horizontally.
Difference, Ones, Tens, Hundreds, Thousands, Change
- Students practiced subtracting 1000s, including across zeros.
- Students practiced subtracting money.
- Students "bought" two items with a $10 bill or a $20 bill and solved to find the change that they would receive.
- Students set up addition problems to check their work.
Use spatial reasoning to solve problems.
Look at a visual spatial puzzle to analyze the pieces and determine which is the correct piece to choose.
Tangrams, Triangles, Parallelograms, Squares
- Students solved tangram puzzles.