standard_description: Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
problem_activity: Problem 4
Pre-unit
Here are the lengths of some lizards in inches. Use the lengths to complete the line plot.
\(2\frac{1}{4}\)
\(1\frac{1}{2}\)
\(2\frac{2}{4}\)
3
\(3\frac{2}{4}\)
2
\(2\frac{1}{4}\)
\(2 \frac{1}{4}\)
\(2\frac{3}{4}\)
2
\(2\frac{1}{4}\)
3
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aligns: no