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3rd grade · Math · Unit 13 of 14

Halves & Fourths of an Inch

Measure to 1/4 inch

What your child practices

Measuring lengths to the nearest half and quarter inch, then reading the measurements from a table like a line plot.

Alaska content standards learning standard: 3.MD.5 · measuring lengths to the nearest half and fourth of an inch and showing the data in a line plot

How we explain it

Children can open this short lesson before they practice.

  1. Each inch on the ruler is split into 4 equal parts.
  2. Count the whole inches, then the parts: 2/4 is the same as 1/2.
  3. A line plot shows how many objects have each length.

Example: A crayon starts at 0 and ends at the second mark after 2. How long is it? 2 whole inches. 2 marks is 2/4 = 1/2. Answer: 2 1/2 inches

Halves & Fourths of an Inch in Alaska

In the Alaska content standards, this is unit 13 of 14 in 3rd grade Math, after Two-Step Stories and before Scaled Graphs.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Alaska Department of Education and Early Development

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which length is the most common?

    Pencil lengths
    LengthPencils
    1 1/4 in1
    1 3/4 in3
    2 1/4 in4
    2 3/4 in6
    • 1 3/4 in
    • 2 3/4 in
    • 1 1/4 in
    • 2 1/4 in

  2. Question 2

    How many pencils are 2 1/4 in long?

    Pencil lengths
    LengthPencils
    1 1/4 in3
    1 3/4 in4
    2 1/4 in5
    2 3/4 in6
    • 6
    • 5
    • 7
    • 2

  3. Question 3

    Which is longer: 1 1/2 in or 1 3/4 in?

    • 1 1/2 in
    • 1 3/4 in

  4. Question 4

    How many pencils were measured in all?

    Pencil lengths
    LengthPencils
    1 in5
    1 1/2 in6
    2 in3
    2 1/2 in4
    • 16
    • 20
    • 18
    • 19

  5. Question 5

    How many pencils are longer than 3 in?

    Pencil lengths
    LengthPencils
    2 in4
    2 1/2 in2
    3 in6
    3 1/2 in5
    • 3
    • 5
    • 6
    • 7

  6. Question 6

    The dots mark the ends of a bean pod on an inch ruler. How long is it?

    012345
    • 1/2 in
    • 3/4 in
    • 1 in
    • 2 in

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