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In this section, students transition from direct comparison of lengths to indirect comparison. They reason about how they can compare the lengths of objects that cannot be easily lined up.
Students begin this transition by ordering the length of three objects directly. Next, they compare two objects by using the length of a third object.
For example, students may compare...
In this section, students solve all types of story problems with unknowns in all positions. They interpret and write addition and subtraction equations that represent the problems.
Students begin by building and comparing concrete objects to solve Compare problems in the context of measurement. These problems involve Bigger or Smaller Unknown, a new problem type for students, and can be...
In this section, students measure the length of objects by iterating length units. They learn the conventions of length measurement and represent their measurements with a number and the name of the length unit. They understand that the length measurement of an object is the number of same-size length units that span it without gaps or overlaps.
Students use manipulatives,...