7.1.C
Math7th Grade
The Standard
select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems
Texas Essential Knowledge and Skills for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students choose an efficient tool or method for each math problem, then use it correctly. They explain why a model, sketch, estimate, calculator, or written method fits.
What Mastery Looks Like
- Given different problems, students select sensible approaches without being told which one to use. They solve accurately and check whether answers are reasonable with an estimate or second method.
Common Misconceptions
- Students may assume a calculator is always the fastest or most accurate choice. They may treat estimates as guesses or choose familiar tools without considering the problem.
How to Assess It
- Exit ticket: A $48 jacket is 25% off. Find the sale price, name your tool or method, and explain why it fits.
Lesson moves
Ways to Teach It
Set out counters, graph paper, fraction strips, and calculators, then have pairs choose one to solve three posted problems.
Ask students to compare mental math and calculator methods for finding 15% of 80, then defend which is more efficient.
Play Tool Match by having teams pair problem cards with method cards and earn points for clear justifications.
Use a grocery ad and a $40 budget, asking students to choose tools to estimate costs and calculate the exact total.
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