# The Number System

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Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers, using the properties of operations, and describing real-world contexts using sums and differences.
Apply and extend previous understandings of multiplication and division.
Understand that a rational number is any number that can be written as a quotient of integers with a non-zero divisor.
Apply properties of operations as strategies, including the standard algorithms, to multiply and divide rational numbers and describe the product and quotient in real-world contexts.
Use division and previous understandings of fractions and decimals. o Convert a fraction to a decimal using long division. o Understand that the decimal form of a rational number terminates in 0s or eventually repeats.
Solve real-world and mathematical problems involving numerical expressions with rational numbers using the four operations.

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