SME
Grade 3 Math · Measurement & Data
Measure length and make line plots
Use this for “How many ribbons are 2 1/2 inches or longer?” on a line plot.
Chart
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2
1 ribbon
2 1/4
3 ribbons
2 1/2
4 ribbons
2 3/4
2 ribbons
3
1 ribbon
Length in inches
Ribbons measured: 11
Ribbons 2 1/2 in or longer: 7
This is an example. Type your own values to start a new problem.
Ribbons at 2 in
example
Ribbons at 2 1/4 in
example
Ribbons at 2 1/2 in
example
Ribbons at 2 3/4 in
example
Ribbons at 3 in
example
Ribbons measured
calculated
Ribbons 2 1/2 in or longer
calculated
Formulas
1 + 3 + 4 + 2 + 1 = 11
Ribbons
at
2
in
+
ribbons
at
2
1
4
in
+
ribbons
at
2
1
2
in
+
ribbons
at
2
3
4
in
+
ribbons
at
3
in
=
ribbons
measured
4 + 2 + 1 = 7
Ribbons
at
2
1
2
in
+
ribbons
at
2
3
4
in
+
ribbons
at
3
in
=
ribbons
2
1
2
in
or
longer
Assumptions
•
Each ribbon is measured to the nearest quarter inch, between 2 and 3 inches.
•
Put one X above the line plot for each ribbon, at its length.
•
2 1/2 inches or longer means the X’s at 2 1/2, 2 3/4 and 3.
Step-by-step
WE KNOW
Ribbons at 2 in: 1
Ribbons at 2 1/4 in: 3
Ribbons at 2 1/2 in: 4
Ribbons at 2 3/4 in: 2
Ribbons at 3 in: 1
FIND
ribbons measured, ribbons 2 1/2 in or longer
Step 1 · Find ribbons measured
1 + 3 + 4 + 2 + 1 = ?
Ribbons at 2 in + ribbons at 2 1/4 in + ribbons at 2 1/2 in + ribbons at 2 3/4 in + ribbons at 3 in = ribbons measured
Count every X on the line plot.
1 + 3 = 4
4 + 4 = 8
8 + 2 = 10
10 + 1 = 11
Ribbons measured = 11
Step 2 · Find ribbons 2 1/2 in or longer
4 + 2 + 1 = ?
Ribbons at 2 1/2 in + ribbons at 2 3/4 in + ribbons at 3 in = ribbons 2 1/2 in or longer
Count
the
X’s
at
2
1
2
inches
and
past
it.
4 + 2 = 6
6 + 1 = 7
Ribbons
2
1
2
in
or
longer
=
7
Check
Put the numbers back in. Both sides should match.
1 + 3 + 4 + 2 + 1 = 11 ✓
4 + 2 + 1 = 7 ✓
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Solve problems using picture graphs
Next lesson →
Measure to the nearest quarter inch
Topic check
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