Toolbox Tracker Guide Toolbox Tracker Guide
Teacher Facilitation & Progress Monitoring • Grade 2 Tier 2
Standard 2.MD.5
Lesson Overview
Objective
Students will solve addition and subtraction word problems involving lengths (same units) within 100 using drawings and equations with a symbol for the unknown.
Target Skills
Visualizing length on a ruler
Translating scenarios to equations
Solving for the unknown symbol (\( ? \))
Small Group Facilitation Script
1. The Hook (2 mins)
"Today we are Blueprint Designers! Sometimes our blueprints aren't finished, and we have to figure out how much more wood or metal we need. How do we find a missing piece of length?"
2. Guided Modeling (8 mins)
Problem: A blue board is 15 cm long. A red board is 10 cm long. How long are they together?
Draw: "Let's draw a line that goes to 15, then another that goes 10 more."Equation: "Our total is unknown. Let's write \( 15 + 10 = ? \)"Solve: "We can count on our ruler or use addition strategies."
3. Scaffolding Strategies (Continuous)
If students struggle with subtraction, relate it to "cutting off" a piece of the ruler drawing.
If students struggle with the symbol, use a literal box \( \Box \) or question mark \( ? \).
Progress Monitoring Tracker
Student Name Models with Drawing Writes Equation (\( ? \)) Solves Correctly Notes/Misconceptions Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P Y / N / P
Key: Y = Yes N = No P = Partial / With Prompting
Watch Out For!
•
Miscounting Units: Students might count the tick marks instead of the spaces (the actual length units) on the ruler drawings.
•
Operation Choice: Students might see "longer" and automatically add, even if the problem asks for the difference.
Blueprint Problems Worksheet Blueprint Problems
Measurement Intervention • 2.MD.5
BUILDER:
DATE:
Sample Design
A wooden board is 8 inches long. We glue another board that is 5 inches long to it. How long is the board now?
1. Draw it
0813
2. Equation
\( 8 + 5 = ? \)
1
A piece of wire is 24 cm long. Leo cuts off 9 cm of the wire. How much wire is left?
Design Drawing Area
Equation with \( ? \)
Final Answer
cm
2
Maya builds a tower 35 inches tall. She adds more blocks to make it 50 inches tall. How many inches did she add?
Design Drawing Area
Equation with \( ? \)
Final Answer
inches
Blueprint Problems (Continued) Page 2
3
A garden path is 62 feet long. A worker removes 15 feet of the path. How long is the path now?
Design Drawing Area
Equation with \( ? \)
Final Answer
feet
Master Builder Challenge
Two snakes are sitting in the sun. The first snake is 42 cm long. The second snake is 18 cm longer than the first. How long is the second snake?
Master Blueprint Drawing
Equation
Answer
cm
Length Lab Slides Length Lab
Solving Length Word Problems
2.MD.5 Intervention Small Group
Designer's Mission
1
Use a Drawing to show the length on a ruler.
2
Write an Equation with a symbol for the unknown.
3
Solve for the Total or the Difference.
Step 1: Draw the Story
"One plank is 12 feet long. Another plank is 8 feet long. How long are they together?"
12 ft
8 ft
?
Step 2: Write the Equation
The Blueprint Math
\( 12 + 8 = ? \)
Part 1
12
Part 2
8
The Unknown
?
Subtracting Length
"A ribbon is 30 cm long. You cut off 10 cm . How long is the ribbon now?"
30 cm Total
-10 cm
\( 30 - 10 = ? \)
Your Turn, Designers!
"Leo has a string 20 inches long. He buys more string and now he has 35 inches."
Question:
How many inches did Leo buy?
Model It
Equation
\( 20 + ? = 35 \)
Final Measurement Exit Ticket Final Measurement
Exit Ticket • 2.MD.5
Score: ____ / 2
Designer Name
Date
?
A paper chain is 25 inches long. Ms. Green takes away 7 inches of the chain.
1. Create a Blueprint Drawing
2. Write an Equation with \( ? \)
3. Final Length
inches
How do you feel about these problems?
😊
😐
😟
Uses Drawing
Writes Equation
Solves Correctly
