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For example, describe a context in which a total number of objects can be expressed as 5 ×7.
Show the measurements by making a line plot, where the horizontal scale is marked off in whole-number units.
Draw a picture graph and a bar graph (with single-unit scale) to represent a data set with up to four categories.
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
Use strategies such as counting on; making ten (e.g., 8 6 = 8 2 4 = 10 4 = 14]; decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9]; using the relationship between addition and subtraction (e.g., knowing that 8 4 = 12, one knows 12 - 8 = 4]; and creating equivalent but easier or known sums (e.g., adding 6 7 by creating the known equivalent 6 6 1 = 12 1 = 13). Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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 and explain the reasoning used.
Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2,..., and represent whole-number sums and differences within 100 on a number line diagram.
Generate measurement data by measuring lengths of several objects to the nearest whole unit, or by making repeated measurements of the same object.
For example, directly compare the heights of two children and describe one child as taller/shorter.
Analyze and compare two- and three-dimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts (e.g., number of sides and vertices/"corners") and other attributes (e.g., having sides of equal length).
Apply properties of operations as strategies to add and subtract.
Examples: If 8 3 = 11 is known, then 3 8 = 11 is also known.