Grade 2: Number and Operations in Base Ten

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CCSS.MATH.CONTENT.2.NBT.A.1 - Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

CCSS.MATH.CONTENT.2.NBT.A.1.A - 100 can be thought of as a bundle of ten tens — called a "hundred."

CCSS.MATH.CONTENT.2.NBT.A.1.B - The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

CCSS.MATH.CONTENT.2.NBT.A.2 - Count within 1000; skip-count by 5s, 10s, and 100s.

CCSS.MATH.CONTENT.2.NBT.A.3 - Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

CCSS.MATH.CONTENT.2.NBT.A.4 - Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

CCSS.MATH.CONTENT.2.NBT.B.5 - Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

CCSS.MATH.CONTENT.2.NBT.B.6 - Add up to four two-digit numbers using strategies based on place value and properties of operations.

CCSS.MATH.CONTENT.2.NBT.B.7 - 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.

	First 100 Days of School Primary Math Worksheet

CCSS.MATH.CONTENT.2.NBT.B.8 - Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.

CCSS.MATH.CONTENT.2.NBT.B.9 - Explain why addition and subtraction strategies work, using place value and the properties of operations.

The curriculum standard for "Number and Operations in Base Ten" in second-grade mathematics education focuses on deepening students' understanding of place value and enhancing their ability to perform arithmetic operations with multi-digit numbers. Students learn to recognize the value of each digit in a three-digit number (hundreds, tens, and ones) and apply this knowledge to compare and order numbers up to 1,000. They develop strategies for adding and subtracting within 1,000, including the use of place value and properties of operations. Students also learn to mentally add and subtract 10 or 100 to or from a given number, further solidifying their grasp of number relationships. The curriculum emphasizes practical applications, such as using place value understanding to solve word problems. This standard is crucial for building a strong numerical foundation, preparing students for more complex arithmetic and problem-solving tasks in higher grades. By mastering these skills, students gain confidence and proficiency in their mathematical abilities, setting the stage for future success in mathematics.

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