Florida B.E.S.T. MA.6.AR.2.4
The Standard
Determine the unknown decimal or fraction in an equation involving any of the four operations, relating three numbers, with the unknown in any position.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students find a missing fraction or decimal by choosing an inverse operation. They handle addition, subtraction, multiplication, and division with the unknown before or after the operation.
What Mastery Looks Like
- Students solve equations such as 2.4 + x = 5.1, 3/4 − x = 1/2, and 6 ÷ x = 1.5. They substitute each answer and confirm both sides are equal.
Common Misconceptions
- Students may use the same inverse operation regardless of where the unknown appears. They often reverse subtraction or division incorrectly, or make errors aligning decimals and finding common denominators.
How to Assess It
- Exit ticket: Solve 3.6 ÷ n = 1.2 and 3/4 + m = 1 1/2. Show each inverse operation and check both answers.
Lesson moves
Ways to Teach It
Use fraction strips and decimal grids to model equation cards, then move pieces to find the missing value.
Prompt students: How does solving 4.5 ÷ x = 1.5 differ from solving x ÷ 1.5 = 4.5?
Run a card match with equations, solution cards, and substitution checks; pairs must justify every match.
Give a grocery receipt with one missing price, discount, or quantity, and have students write and solve the matching equation.
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Printable MA.6.AR.2.4 Worksheet
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Related Standards
- MA.1.AR.2.3
Determine the unknown whole number in an addition or subtraction equation, relating three whole numbers, with the unknown in any position.
- MA.3.AR.2.3
Determine the unknown whole number in a multiplication or division equation, relating three whole numbers, with the unknown in any position.
- MA.5.AR.2.4
Given a mathematical or real-world context, write an equation involving any of the four operations to determine the unknown whole number with the unknown in any...
- MA.2.AR.2.2
Determine the unknown whole number in an addition or subtraction equation, relating three or four whole numbers, with the unknown in any position.
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