During Unit 1, your children will develop and practice efficient addition and subtraction of multi-digit whole numbers, while extending their understanding of place value concepts.  Fourth grade is the initial grade level in which students are expected to be proficient at using the standard algorithm for addition and subtraction.  As well, your children may continue to use previously learned strategies, based on place value concepts and the properties of operations.  They will reason about the magnitude of the digits in a whole number.  Your children will demonstrate flexibility with the different forms that numbers can be written.  They will apply their understanding of place value and number sense to reason and explain about rounded answers. 

Printable Parent Letter

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Key Vocabulary:  Algorithm, Commutative property, Difference, Sum, Digits, Equation, Estimate, Expression, Millions, Thousands, Hundreds, Tens, Ones, Variable, Value, Expeanded form

Students need to:

  • Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form.  Compare two multi-digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.

Read and Write Numbers

Comparing Numbers
  • Use place value understanding to round multi-digit whole numbers to any place.

Rounding with Number Lines
  • Add and subtract multi-digit whole numbers using the standard algorithm. 

Addition Algorithm

Subtraction Algorithm