1.OA.1a:
Operations And Algebraic Thinking
Represent And Solve Problems Involving Addition And Subtraction.
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
1.MD.1:
Measurement And Data
Measure Lengths Indirectly And By Iterating Length Units.
Order three objects by length; compare the lengths of two objects indirectly by using a third object.
1.MD.2:
Measurement And Data
Measure Lengths Indirectly And By Iterating Length Units.
Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.
