8.1.C
Math8th 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 decide which tool or method will solve a problem accurately and efficiently. They use the choice, explain why it fits, and check whether the answer is reasonable.
What Mastery Looks Like
- Students choose a tool or method that fits the numbers and the task. They solve accurately, explain why their choice was efficient, and use estimation to check the result.
Common Misconceptions
- Students may reach for a calculator even when mental math is faster. They may confuse an estimate with an exact answer or choose a familiar tool that does not fit the problem.
How to Assess It
- Give this exit ticket: “A $48 jacket is 25% off. Choose a tool or method, find the sale price, and explain your choice.”
Lesson moves
Ways to Teach It
Set up stations with algebra tiles, rulers, graph paper, calculators, and problem cards, then have students choose a tool and defend their choice.
Show three methods for solving one problem and ask students to write which method is most efficient and why.
Play a tool-match relay where teams pair problem cards with mental math, estimation, paper, manipulatives, or technology before solving.
Have students compare two phone plans in a spreadsheet, then explain why technology helped more than mental math or paper calculations.
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