Texas Go Math Grade 2 Lesson 17.2 Answer Key Add and Subtract Lengths

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Texas Go Math Grade 2 Lesson 17.2 Answer Key Add and Subtract Lengths

Essential Question
How can drawing a diagram help when solving problems about lengths?
Drawing diagrams is a useful problem solving heuristic. Diagrammatic representations have been shown to be superior to verbal representations when solving problems

Unlock the Problem
Nate had 23 centimeters of string. He gave 9 centimeters of string to Myra. How much string does Nate have now?

Read
What information am I given?
Nate had __ centimeters of string.
He gave ______ centimeters of string to Myra.

Plan
What is my plan or strategy?
I can _______________ to show the problem.

Solve
Show how you solve the problem.
Texas Go Math Grade 2 Lesson 17.2 Answer Key 20
Nate has ___ centimeters of string now.
Explanation:

Read
What information am I given?
Nate had 23 centimeters of string.
He gave 9 centimeters of string to Myra.

Plan
What is my plan or strategy?
I can Draw to show the problem.

Solve
Show how you solve the problem.
Texas Go Math Grade 2 Lesson 17.2 Answer Key 20
Nate has 14 centimeters of string now.
23 – 9 = 14

Home Connection

  • Your child drew a diagram to represent a problem about lengths. The diagram can be used to choose the operation for solving the problem.

Draw a diagram. Then solve.

Question 1.
Ellie has a ribbon that is 12 centimeters long. Gwen has a ribbon that is 9 centimeters long. How many centimeters of ribbon do they have?

  • What information am I given?
  • What is my plan or strategy?

Texas Go Math Grade 2 Lesson 17.2 Answer Key 21
Texas Go Math Grade 2 Lesson 17.2 Answer Key 22
They have ___ centimeters of ribbon.
Answer: 3 centimeters

Explanation:
They have 3 centimeters of ribbon.
total 12 centimeters
Gwen has a ribbon that is 9 centimeters long
12 – 9 = 3

Question 2.
A strip of paper is 24 centimeters long. Justin tears 8 centimeters off of the strip. How long is the strip of paper now?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 23
Now the strip of paper is ___ centimeters long.
Answer: 16 centimeters

Explanation:
Total strip of paper is 24 centimeters long
24 – 8 = 16
16 centimeters long is the strip of paper now

Math Talk
Mathematical Processes
Is your answer for the first problem reasonable? Explain.
Explanation:
Ellie has a ribbon that is 12 centimeters long.
Gwen has a ribbon that is 9 centimeters long.
12  – 9 = 3
3 centimeters of ribbon  they have

Share and Show

Draw a diagram. Then solve.

Question 3.
A chain of paper clips is 18 centimeters long. Sondra adds 6 centimeters of paper clips to the chain. How long is the chain now?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 24
The chain is ___ centimeters long now.
Answer: 12 centimeters

Explanation:
A chain of paper clips is 18 centimeters long.
Sondra adds 6 centimeters of paper clips to the chain.
18 – 6 = 12
The chain is 12  centimeters long now.

Problem Solving

Question 4.
H.O.T. Multi-Step A chalk mark was 22 centimeters long. Greg erased part of the mark. Now it is 5 centimeters long. How many centimeters of the mark did Greg erase?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 25
Texas Go Math Grade 2 Lesson 17.2 Answer Key 26
Greg erased __ centimeters of the mark.
Answer:
Greg erased 17 centimeters of the mark.

Explanation:
A chalk mark was 22 centimeters long.
Greg erased part of the mark.
Now it is 5 centimeters long.
22 – 5 = 17 centimeters long.

Question 5.
H.O.T. Start at the point on the number line. Draw a diagram to stand for a length of 12 centimeters.
Texas Go Math Grade 2 Lesson 17.2 Answer Key 27
Answer:

Explanation:
Started from the point
The point started at 4
to draw the standard length of 12 centimeters.
16 – 12 = 4

Daily Assessment Task

Draw a diagram to solve.

Question 6.
Use Diagrams Ella has a piece of yarn that is 25 centimeters long. She uses
8 centimeters of it for a project. How many centimeters of yarn does she have now?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 28
Ella has ___ centimeters of yarn now.
Explain how your diagram shows that your answer is reasonable.

  • What information am I given?
  • What is my plan or strategy?

Answer:

Explanation:
Ella has a piece of yarn that is 25 centimeters long.
8 centimeters of it for a project.
25 – 8 = 17 centimeters long.
Ella has17 centimeters of yarn now.

Question 7.
Texas Test Prep Amber has a blue ribbon that she measures in centimeters. She draws this diagram to show the length of the ribbon. How many centimeters long is her ribbon?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 29
(A) 20 centimeters
(B) 18 centimeters
(C) 22 centimeters
Answer: B
Explanation:
20 – 2 = 18 centimeters

Take Home Activity

  • Have your child explain how he or she used a diagram to solve a problem in this lesson.
    Explanation:
    By measuring with the centimeter number line.

Texas Go Math Grade 2 Lesson 17.2 Homework and Practice Answer Key

Draw a diagram. Then solve.

Question 1.
Mary Beth has a ribbon that is 15 centimeters long. Alicia has a ribbon that is 9 centimeters long. How many centimeters of ribbon do they have?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 30
They have ___ centimeters of ribbon.
Answer:

They have 24 centimeters of ribbon.
Explanation:
Mary Beth has a ribbon that is 15 centimeters long.
Alicia has a ribbon that is 9 centimeters long.
15 + 9 = 24

Problem Solving

Question 2.
Multi-Step A string is 21 centimeters long. Sue cuts off a piece of the string. Now the string is only 8 centimeters long. How many centimeters of string did Sue cut off?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 31
Sue cut off ___ centimeters of string.
Answer:
Sue cut off 13 centimeters of string.

Explanation:
A string is 21 centimeters long.
Sue cuts off a piece of the string.
Now the string is only 8 centimeters long.
21 – 8 = 13

Texas Test Prep

Lesson Check

Choose the correct answer.

Question 3.
Faith has a ribbon that she measures in centimeters. She draws this diagram to show the length of the ribbon. How many centimeters long is her ribbon?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 32
(A) 19 centimeters
(B) 16 centimeters
(A) 17 centimeters
Answer: B
Explanation:
17 – 1 = 16 centimeters
16 centimeters long is her ribbon

Question 4.
Jim draws a diagram to show the length of his two chains. How many centimeters of chain does Jim have?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 33
(A) 12 centimeters
(B) 8 centimeters
(C) 10 centimeters
Answer: A
Explanation :
6 + 6 = 12
Jim have 12 centimeters of chain

Question 5.
Multi-Step Jan has a piece of yarn that is 24 centimeters long. She uses 6 centimeters of it for a project and 9 centimeters of it for another project. How many centimeters of yarn does she have left?
Texas Go Math Grade 2 Lesson 17.2 Answer Key 34
(A) 9 centimeters
(B) 19 centimeters
(C) 15 centimeters
Answer: A
Explanation:
Jan has a piece of yarn that is 24 centimeters long.
She uses 6 centimeters of it for a project and 9 centimeters of it for another project
6 + 9 = 15
24 – 15 = 9

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