Common Core Math · Grade 3
Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b.
Why water teaches this standard well
Students shade one of four equal sections on a picture of a gallon jug to show 1/4 gallon, then combine three of those sections to show 3/4 gallon. Seeing a fraction as a stack of equal water portions builds the intuition needed for measuring partial liters in a lab beaker.
Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.
Grade 3 Lesson plan
A 45-minute grade 3 lesson where students partition a creek staff gauge board into equal parts and name unit fractions and their multiples at a fictional gauging station.
Grade 3 Lesson plan
Students fold paper gauge strips into equal parts to read how full a fictional school's rain barrel is, naming unit fractions and building fractions from equal parts.
Grade 3 Worksheet
A grade 3 worksheet where students design a reservoir-level gauge in equal bands and name the shaded parts as fractions like one fourth and three fourths.
Grade 3 Worksheet
A grade 3 worksheet where students split a one-liter test beaker into equal parts to name unit fractions and write fractions of a liter at a fictional water lab.
Grade 3 Math problem set
A grade 3 problem set where volunteers fill quarter-marked jugs from a community garden's well, building and comparing fractions of a whole gallon.
Grade 3 Project
A four-session grade 3 project where teams paint a mock-up of a welcome mural on four equal panels, one per water-cleaning step, and caption each fourth.