Extend Understanding of Fraction Equivalence and
Ordering
4.NF.A.1
Explain why a fraction a/b is
equivalent to a fraction (n × a)/(n × b)
by using visual fraction models, with attention to
how the number and size of the parts differ even
though the two fractions themselves are the same
size. Use this principle to recognize and generate
equivalent fractions.
4.NF.A.2
Compare two fractions with different numerators and
different denominators, e.g., by creating common
denominators or numerators, or by comparing to a
benchmark fraction such as 1/2. Recognize that
comparisons are valid only when the two fractions
refer to the same whole. Record the results of
comparisons with symbols >, =, or <, and justify the
conclusions, e.g., by using a visual fraction model.
Build fractions from unit fractions.
4.NF.B.3
Understand a fraction a/b with a >
1 as a sum of fractions 1/b.
4.NF.B.3.A
Understand addition and subtraction of fractions
as joining and separating parts referring to the
same whole.
4.NF.B.3.B
Decompose a fraction into a sum of fractions
with the same denominator in more than one way,
recording each decomposition by an equation.
Justify decompositions, e.g., by using a visual
fraction model.
Examples:
3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8
= 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8.
4.NF.B.3.C
Add and subtract mixed numbers with like
denominators, e.g., by replacing each mixed
number with an equivalent fraction, and/or by
using properties of operations and the
relationship between addition and subtraction.
4.NF.B.3.D
Solve word problems involving addition and
subtraction of fractions referring to the same
whole and having like denominators, e.g., by
using visual fraction models and equations to
represent the problem.
4.NF.B.4
Apply and extend previous understandings of
multiplication to multiply a fraction by a whole
number.
4.NF.B.4.A
Understand a fraction
a/
b as
a multiple of 1/
b.
For
example, use a visual fraction model to
represent 5/4 as the product 5 × (1/4),
recording the conclusion by the equation 5/4 = 5
× (1/4).
4.NF.B.4.B
Understand a multiple of a/b as a multiple of
1/b, and use this understanding to multiply a
fraction by a whole number.
For
example, use a visual fraction model to express
3 × (2/5) as 6 × (1/5), recognizing this product
as 6/5. (In general, n × (a/b) = (n × a)/b.)
4.NF.B.4.C
Solve word problems involving multiplication of
a fraction by a whole number, e.g., by using
visual fraction models and equations to
represent the problem.
For
example, if each person at a party will eat 3/8
of a pound of roast beef, and there will be 5
people at the party, how many pounds of roast
beef will be needed? Between what two whole
numbers does your answer lie?
Understand decimal notation for fractions,
and compare decimal fractions.
4.NF.C.5
Express a fraction with denominator 10 as an
equivalent fraction with denominator 100, and
use this technique to add two fractions with
respective denominators 10 and 100.
For
example, express 3/10 as 30/100, and add 3/10 +
4/100 = 34/100.
4.NF.C.6
Use decimal notation for fractions with
denominators 10 or 100.
For
example, rewrite 0.62 as 62/100; describe a
length as 0.62 meters; locate 0.62 on a number
line diagram.
4.NF.C.7
Compare two decimals to hundredths by reasoning
about their size. Recognize that comparisons are
valid only when the two decimals refer to the
same whole. Record the results of comparisons
with the symbols >, =, or <, and justify the
conclusions, e.g., by using a visual model.