We included **HMH Into Math Grade 2 Answer Key PDF** **Module 20 Relate Addition and Subtraction to Length **to make students experts in learning maths.

## HMH Into Math Grade 2 Module 20 Answer Key Relate Addition and Subtraction to Length

**How Many Links?**

Rahanna is making a paper chain. So far, her paper chain has 42 links. Milo makes 12 links to add to Rahanna’s chain. How many links are in her paper chain now?

Solve this problem on a number line.

Write an equation to model the work you did on the number line.

There are now ________ links in Rahanna’s paper chain.

Answer:

There are now 54 links in Rahanna’s paper chain.

Explanation:

Rahanna paper chain has 42 links.

Milo makes 12 links to add to Rahanna’s chain.

let n be the total number of chains

n = 42 + 12

n = 54

On the number line marked number 42 as the starting point and adding 12 to it.

so, moving forward on number line and counting numbers up to 12 that is 54

**Turn and Talk**

Make up your own problem about Rahanna’s links. This time, have her give some links away. Trade problems with a partner and solve.

Answer:

Rahanna is making a paper chain. So far, her paper chain has 42 links. she gave 12 links to Milo. Rahanna’s chain has how many links?

Explanation:

let n be the links that Rahanna have

n = 42 – 12

n = 30

so, Rahanna’s chain has 30 links.

**Are You Ready?**

Complete these problems to review prior concepts and skills you will need for this module.

**Use a Number Line to Count On**

Question 1.

Count on to solve. Show your work on the number line.

14 + 8 = __________

Answer:

Explanation:

On the number line marked number 14 as the starting point and adding 8 to it.

so, moving forward on number line and counting numbers up to 8 and reached the number 22.

**Use a Number Line to Count Back**

Question 2.

Count back to solve. Show your work on the number line.

25 – 13 = ____________

Answer:

Explanation:

On the number line marked number 25 as the starting point and subtracting 13 to it

so, moving backward on number line and counting numbers up to 813 and reached the number 12.

**Place Value Addition**

Question 3.

Draw a quick picture. Use tens and ones to add.

Answer:

Explanation:

5 + 6 = 11

so, 1 is placed in the answer place and 1 is taken as carry forward

1 + 1 + 1 = 3

15 + 16 = 31