Major Cluster
Standards

Geometric Measurement: understand concepts of area and relate
area to multiplication and to addition.

3.MD.5

Recognize
area as an attribute of plane figures and understand concepts of area
measurement:
a.
A square with side length 1 unit, called “a unit square,” is said to have
“one square unit” of area, and can be used to measure area.
b.
A plane figure which can be covered without gaps or overlaps by n unit
squares is said to have an area of n square units.

3.MD.6

Measure
areas by counting unit squares (square cm, square m, square in, square ft,
and improvised units).

3.MD.7

Relate
area to the operations of multiplication and addition.
a.
Find the area of a rectangle with wholenumber side lengths by tiling it, and
show that the area is the same as would be found by multiplying the side
lengths.
b.
Multiply side lengths to find areas of rectangles with wholenumber side
lengths in the context of solving real world and mathematical problems, and
represent wholenumber products as rectangular areas in mathematical
reasoning.
c.
Use tiling to show in a concrete case that the area of a rectangle with
wholenumber side lengths a and b + c is the sum of a × b and a × c. Use area models to represent the distributive property
in mathematical reasoning.

Understand properties of
multiplication and the relationship between multiplication and division.

3.OA.5

Apply properties of operations
as strategies to multiply and divide. (Students need not use formal terms
for these properties.) Examples: If 6 × 4 = 24 is known, then 4 × 6 = 24 is
also known. (Commutative property of multiplication.) 3 × 5 × 2 can be
found by 3 × 5 = 15, then 15 × 2 = 30, or by 5 × 2 = 10, then 3 × 10 = 30.
(Associative property of multiplication.) Knowing that 8 × 5 = 40 and 8 × 2
= 16, one can find 8 × 7 as 8 × (5 + 2) = (8 × 5) + (8 × 2) = 40 + 16 = 56.
(Distributive property.)

Solve problems
involving the four operations, and identify and explain patterns in
arithmetic.

3.OA.8

Solve twostep word problems using
the four operations. Represent these problems using equations with a letter
standing for the unknown quantity. Assess the reasonableness of answers
using mental computation and estimation strategies including rounding.
