An equation may contain a variable and an equal symbol (=).

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### Related standards

- This standard is part of: 5.19

#### More specific sub-standards

For example, the sentence, “A full box of cookies and four extra equal 24 cookies.” can be written as 𝑏 + 4 = 24, where b stands for the number of cookies in one full box. “Three full boxes of cookies contain a total of 60 cookies” can be written as 3𝑏 = 60.

#### Similar standards in other grades

Equations may be written with sums and differences at the beginning of the equation (e.g., 8 = 5 + 3).

An equation (number sentence) is a mathematical statement representing two expressions that are equivalent. It consists of two expressions, one on each side of an 'equal' symbol (e.g., 5 + 3 = 8, 8 = 5 + 3 and 4 + 3 = 9 − 2).

Equations should be routinely modeled in conjunction with story problems. Manipulatives such as connecting cubes and counters can be used to model equations.

Manipulatives such as connecting cubes, counters, and number scales can be used to model equations.

An equation is a mathematical sentence in which two expressions are equivalent. It consists of two expressions, one on each side of an 'equal' symbol (e.g., 5 + 3 = 8, 8 = 5 + 3 and 4 + 3 = 9 - 2).