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Estimating answers (age 13+)

PROCEDURAL
MathematicsAlgebra|Ages 13—14|ID: mt_Yw27nweoTj

Use graphs of linear and quadratic functions to estimate output values for given inputs, find approximate solutions to equations, and interpret graphical information in real-world contexts

Mastery Evidence

  • Read off an approximate y-value for a given x from a plotted curve
  • Find approximate solutions to an equation by identifying where a graph crosses the x-axis or another line
  • Interpret a real-world graph (e.g., distance–time) to answer contextual questions

Assessment Prompt

“Can [child] use a graph — whether a straight line or a curve — to read off an answer to an equation approximately, rather than solving it algebraically?”

Curriculum Standards3 alignments

8.F.5Common Core State Standards for Mathematics
Qualitative description of functions

Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally.

F
KS3.Maths.Alg.12The national curriculum in England
Estimate Values and Solve Simultaneous Equations

use linear and quadratic graphs to estimate values of y for given values of x and vice versa and to find approximate solutions of simultaneous linear equations

Mathematics · Key Stage 3
KS3.Maths.Alg.13The national curriculum in England
Approximate Solutions from Graphs

find approximate solutions to contextual problems from given graphs of a variety of functions, including piece-wise linear, exponential and reciprocal graphs

Mathematics · Key Stage 3

Prerequisites2

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