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Grade 3 · Maths · Lessons
Marks in halves and fourths
📏ruler✏️crayon❌X🔢halves and fourths
Measure to a fraction.
The big ideaCount the parts past the whole inch. Put one X over its length.

How it works

Measure in halves and fourths of an inch.

Count the parts past the whole inch. Put one X over its length.

Read the line plot by counting the X's.

Halves• each is 1/2 inch• 2 halves make 1 inchFourths• each is 1/4 inch• 4 fourths make 1 inch
Halves and fourths of an inch.

Example 1: Read a length

  1. A crayon is 3 whole inches and one half more.
  2. Write the whole inches, then the part.
  3. It is 3 1/2 inches long.

Example 2: A fourth

  1. A craft stick is 1 whole inch and 3 fourths more.
  2. Count 3 fourth-marks past the 1.
  3. It is 1 3/4 inches long.

Example 3: Count X's

  1. A line plot has 5 X's over lengths longer than 2 1/2 in.
  2. Count them one by one.
  3. 5 strips are longer than 2 1/2 in.

Words to know

fourth
One of four equal parts.
half
One of two equal parts.

Watch out

Try it

  1. A pencil is 4 whole inches and a half more. How long?
  2. How many fourths make a half?
  3. One X goes over each what?
  4. What do you count to find 'how many'?
Answers: 1. 4 1/2 in · 2. 2 · 3. length measured · 4. the X's
For grown-upsMeasure pens to the nearest half inch and make a line plot of their lengths.
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