Place Value
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4.NBT.A.1 Recognize that in a multi-digit whole number (less than or equal to 1,000,000), a digit in one place represents 10 times as much as it represents in the place to its right. For example, recognize that 7 in 700 is 10 times bigger than the 7 in 70 because 700 ÷ 70 = 10 and 70 x 10 = 700.
4.NBT.A.2 Read and write multi-digit whole numbers (less than or equal to 1,000,000) using standard form, word form, and expanded form. (e.g .the expanded form of 4256 is written as 4 X 1000 + 2 X 100 + 5 X 10 + 6 X 1).
4.NBT.A.3 Round multi-digit whole numbers to any place (up to and including hundred-thousands place) using understanding of place value.
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WHY? Students need to be able to explain how the value of a digit in one number compares to the value in another using appropriate vocabulary. Students should discover the patterns occurring in the value of the digits as they move from one place to the next. Once this understanding is solidified, students will use this knowledge to compare numbers and then to solve addition and subtraction problems using various strategies that were developed in earlier grades and are only extended here to include larger numbers.