Curriculum for Grade 2
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Students extend their understanding of addition and subtraction within 20. Use of base-10 blocks reinforces the concept of a “ten” to build place value understanding. Students move quickly from concrete models to more abstract equations. Students build their fluency with addition and subtraction facts, including those across a 10, by modeling the underlying concept of exchanging and memorizing number bonds of 10.
Students add and subtract with exchanging as represented by crossing a ten on the number line or making/breaking rods with base-10 blocks. Students use strategies such as “resting” on a round number to add or subtract across a ten or using 10 in place of 8 or 9 and adjusting their answer. Students build their fluency with +/- facts within 20. They work with equations with three addends.
Students apply their counting and place value skills to three-digit numbers to 200. They reinforce their understanding of a hundred using the base-10 flat, place value cards, and a set of filled ten-frames.
Students apply their counting, reading, and place value skills to three-digit numbers. Students use the hundred chart as well as vertical and horizontal number lines to count forward and backward, identify missing numbers, and identify number names. Students address the challenging skill of counting across tens within a hundred and across a hundred. They strengthen their conceptual understanding of counting patterns and their ability to count mentally in the hundreds.
Students rely on solid place value understanding to focus on the relationship between a three-digit number and its constituent parts. They strengthen their recognition of written number names and begin working with numbers that have placeholder zeros.
Students are introduced to the thousand cube base-10 block as they build their concept of a thousand. They also explore the relationships between ones, tens, hundreds, and thousands as well as the count sequence using familiar representations.
Students compare numbers by sequencing or using inequality symbols. These comparisons rely on identifying differences in the hundreds, tens, or ones digits. Familiar exercises become increasingly challenging by using numbers with placeholder zeros and numbers with transposed digits.
Students reinforce place value understanding by exploring counting patterns. They determine 1 more, 1 less, 10 more, 10 less, 100 more, and 100 less using base-10 blocks, the number line, and equations.
Students practice strategies for solving two-digit +/- problems without exchanging. Students apply their knowledge of place value, addition and subtraction, and number flexibility to solve equations and non-traditional problems using familiar representations (base-10 blocks, place value cards, hundred chart, and equations)
Students use familiar manipulatives to solve two-digit addition problems with understanding. They rely on place value knowledge and understanding of round numbers to solve problems with exchanging. These exercises reinforce the strategy of adding all tens and all ones and then combining the two. As students use place value cards, they learn to maintain values even without placeholder zeros.
Students use familiar manipulatives to solve two-digit subtraction problems with understanding. They rely on place value knowledge and understanding of round numbers to solve problems with exchanging. Students learn to determine whether or not an exchange is needed and if so, how to do so with understanding. As students use place value cards, they learn to maintain values even without placeholder zeros.