Florida B.E.S.T. MA.K12.MTR.6

MathGrades K–12

B.E.S.T. Standard (Benchmark Cluster)

Assess the reasonableness of solutions.

Florida B.E.S.T. Standards for Mathematics

Cluster contents

MA.K12.MTR.6 is a B.E.S.T. standard. These are the benchmarks under it.

Teacher's field guide

What Students Need to Do: Students predict a sensible range before solving. After solving, they use estimation, benchmarks, inverse operations, units, and context to check the result.
What Mastery Looks Like: A student gives a likely range, solves, and compares the result with that range. When an answer does not fit, the student identifies a likely error, corrects it, and explains the check.
Common Misconceptions: Students may trust an exact calculation or calculator display even when the size, sign, or unit is wrong. They may think an estimate must match exactly, or check only their arithmetic and ignore the situation.
How to Assess It: Exit ticket: Display a worked example from today's lesson, but replace its answer with one having the wrong size, sign, or unit. Ask students to circle the clue and write one check.

Lesson moves

Give pairs counters and answer cards, then have them build a model and sort answers into sensible and impossible piles.
Post an incorrect solution from the current unit and ask students to name the first clue that the answer cannot be right.
Play Reasonable or Not: reveal a problem and proposed answer, then award points for checks using estimation, units, or inverse operations.
Use a grocery receipt, travel time, or measurement estimate, and have students flag one total that does not fit the situation.

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$Preview of the MA.K12.MTR.6 printable worksheet$

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