LAC 28:CXLII.703. Numeracy and Operational Fluency

A. Add and subtract within 20. 1. Fluently add and subtract within 20 using mental strategies. By the end of Grade 2, know from memory all sums of two one-digit numbers. B. Understand place value. 1. Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand the following as special cases: 100 can be thought of as a bundle of ten tens – called a “hundred”, the numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three four, five, six, seven, eight, or nine hundreds. 2. Count forward and backward up to 1000, starting at any number less than 1000. a. Skip-count by 2s, 5s, 10s, and 100s. 3. Read and write numbers up to 1000 using base-ten numerals/standard form, number names/written form, unit form, and expanded form. 4. Compare two three-digit numbers based on values of hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons. C. Use place value understanding and properties of operations to add and subtract. 1. Fluently add and subtract up to 100 using strategies based on place value, properties of operations, and/or the part:whole relationship between addition and subtraction. 2. Add up to four two-digit numbers using strategies based on place value and properties of operations. 3. For a given number 100 – 900, mentally add 10 or 100 and mentally subtract 10 or 100. 4. Construct a written explanation or drawing for why addition and subtraction strategies work, using place value understanding and the properties of operations.