Use equivalent fractions as a strategy to add and
subtract fractions.
5.NF.A.1
Add and subtract fractions with unlike denominators
(including mixed numbers) by replacing given
fractions with equivalent fractions in such a way as
to produce an equivalent sum or difference of
fractions with like denominators. For
example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In
general, a/b + c/d = (ad + bc)/bd.)
5.NF.A.2
Solve word problems involving addition and
subtraction of fractions referring to the same
whole, including cases of unlike denominators, e.g.,
by using visual fraction models or equations to
represent the problem. Use benchmark fractions and
number sense of fractions to estimate mentally and
assess the reasonableness of answers. For
example, recognize an incorrect result 2/5 + 1/2 =
3/7, by observing that 3/7 < 1/2.
Apply and extend previous understandings of
multiplication and division.
5.NF.B.3
Interpret a fraction as division of the
numerator by the denominator (a/b = a÷ b).
Solve word problems involving division of whole
numbers leading to answers in the form of
fractions or mixed numbers, e.g., by using
visual fraction models or equations to represent
the problem. For
example, interpret 3/4 as the result of dividing
3 by 4, noting that 3/4 multiplied by 4 equals
3, and that when 3 wholes are shared equally
among 4 people each person has a share of size
3/4. If 9 people want to share a 50-pound sack
of rice equally by weight, how many pounds of
rice should each person get? Between what two
whole numbers does your answer lie?
5.NF.B.4.
Apply and extend previous understandings of
multiplication to multiply a fraction or whole
number by a fraction.
5.NF.B.4.A
Interpret the product (a/b)
× q as a parts
of a partition of q into b equal
parts; equivalently, as the result of a sequence
of operations a × q ÷ b. For
example, use a visual fraction model to show
(2/3) × 4 = 8/3, and create a story context for
this equation. Do the same with (2/3) × (4/5) =
8/15. (In general, (a/b) × (c/d) = (ac)/(bd).
5.NF.B.4.B
Find the area of a rectangle with fractional
side lengths by tiling it with unit squares of
the appropriate unit fraction side lengths, and
show that the area is the same as would be found
by multiplying the side lengths. Multiply
fractional side lengths to find areas of
rectangles, and represent fraction products as
rectangular areas.
5.NF.B.5
Interpret multiplication as scaling (resizing),
by:
5.NF.B.5.A
Comparing the size of a product to the size of
one factor on the basis of the size of the other
factor, without performing the indicated
multiplication.
5.NF.B.5.B
Explaining why multiplying a given number by a
fraction greater than 1 results in a product
greater than the given number (recognizing
multiplication by whole numbers greater than 1
as a familiar case); explaining why multiplying
a given number by a fraction less than 1 results
in a product smaller than the given number; and
relating the principle of fraction equivalence a/b =
(n × a)/(n × b)
to the effect of multiplying a/b by
1.
5.NF.B.6
Solve real world problems involving
multiplication of fractions and mixed numbers,
e.g., by using visual fraction models or
equations to represent the problem.
Understand decimal notation for fractions,
and compare decimal fractions.
5.NF.B.7
Apply and extend previous understandings of
division to divide unit fractions by whole
numbers and whole numbers by unit fractions.
5.NF.B.7.A
Interpret division of a unit fraction by a
non-zero whole number, and compute such
quotients. For
example, create a story context for (1/3) ÷ 4,
and use a visual fraction model to show the
quotient. Use the relationship between
multiplication and division to explain that
(1/3) ÷ 4 = 1/12 because (1/12) × 4 = 1/3.
5.NF.B.7.B
Interpret division of a whole number by a unit
fraction, and compute such quotients. For
example, create a story context for 4 ÷ (1/5),
and use a visual fraction model to show the
quotient. Use the relationship between
multiplication and division to explain that 4 ÷
(1/5) = 20 because 20 × (1/5) = 4.
5.NF.B.7.C
Solve real world problems involving division of
unit fractions by non-zero whole numbers and
division of whole numbers by unit fractions,
e.g., by using visual fraction models and
equations to represent the problem. For
example, how much chocolate will each person get
if 3 people share 1/2 lb of chocolate equally?
How many 1/3-cup servings are in 2 cups of
raisins?