A unit last around 13 days to meet Common Core State Standards related to place value. Included:
Morning work (or daily warm up) to practice fact fluency (2.OA.B.2 - Fluently add and subtract within 20 using mental strategies. By the end of second grade, know all sums of two one-digit numbers.), fact families, and reviewing word problems (2.OA.A.1 Use addition and subtraction to solve one and two-step word problems) using simple numbers (answers less than 20).
Daily lessons that include practice, activities that can be used for the lesson and added to a math notebook for continued use, flapbooks that help students visualize concepts and organize information, unit vocabulary that allows students to match vocabulary words to their definition, and more for standards:
2.NBT.A.1 Understand that the three digits of a three-digit number represent how many hundreds, tens and ones.
2.NBT.A.1a I understand that 100 can be thought of as a bundle of ten tens and is called a “hundred”.
2.NBT.A.1b I understand that 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).
2.NBT.A.2 I can count within 1000:
Skip count by 5 Skip count by 10 Skip count by 100
2.OA.C.3 I can determine if a group of objects has an even or odd number of members. I can write an equation to express an even number as a sum of two equal addends.
2.NBT.A.3 I can read and write numbers to 1000 using:
Base-ten numerals Number names Expanded form
2.NBT.A.4 I can compare two three-digit numbers based on the meanings of the hundreds, tens, and ones digits. I can use <,>, and = symbols to record the results of the comparisons.
A pre-test and post-test are included so that you can easily see what knowledge your students already have prior to teaching the unit, and a post-test to celebrate their growth!
There is a simple outline of how my 2nd grade team and I taught this unit, helping to organize it for you visually.
Because RTI and intervention are becoming more common, this unit can be used in first grade (for enrichment), second grade to meet grade-level standards, and third grade (skill remediation).