LAC 28:CXLII.503. Numeracy and Operational Fluency

A. Add and subtract. 1. Relate counting to addition and subtraction. 2. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. a. Use mental strategies such as counting on or counting back, using a number line or path, making ten, decomposing a number leading to a ten, using the part-whole relationship between addition and subtraction, creating equivalent but easier or known sums. 3. Given a two-digit number, mentally find one more, 10 more, one less, or 10 less than a given number, without having to count. a. Justify the reasoning used when computing mentally with an oral and/or written explanation. B. Extending the counting sequence. 1. Count to 120, starting at any number less than 120. a. Count forward and backward to 120 by ones, fives, and tens. b. In this range, read, write, and identify numerals and number names written in words. C. Understand place value. 1. Understand that the two digits of a two-digit number represent amounts of tens and ones. a. Read, write, and represent two-digit numbers up to 99 using base-ten numerals, standard form, word form, and unit form. Understand the following as special cases: 10 can be thought of as a bundle of ten ones – called a “ten”, the numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones: the numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens and 0 ones.