Math Mammoth Place Value 3Math Mammoth Place Value 3 is a short worktext meant for third grade level that focuses on four digit numbers. The first lessons cover place value and comparing four digit numbers. The rest of the book deals with addition, subtraction, and word problems. First, students learn to write and read four digit numbers. Then they learn about the concept of place value, write numbers in expanded form, and place them on number lines. One lesson is spent