All the solutions provided in McGraw Hill My Math Grade 5 Answer Key PDF Chapter 5 Lesson 9 Subtract Decimals Using Models will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 5 Answer Key Chapter 5 Lesson 9 Subtract Decimals Using Models
Build It
Find 2.4 – 1.07. Use models.
1. Use 10-by-10 grids to model 2.4.
To show 2.4, shade two whole grids and four tenths of a third grid.
Four tenths is equal to _____________ small squares.
Answer:
Four-tenths is equal to 40 small squares.
2. Subtract 1.07.
To subtract 1.07, cross out 1 whole grid and 7 hundredths of the third grid.
3. Count the remaining shaded squares.
How many ones are there? _____________
Answer:
There are one ones.
How many tenths are there? _____________
Answer:
There are three-tenths.
How many hundredths are there? _____________
Answer:
There are three hundredths.
So, 2.4 – 1.07 = 1.33.
Check Use addition to check your answer.
1.07 + _____________ = 2.4
Answer:
1.07+1.33 = 2.4.
Explanation:
To check the answer we will add 1.07+1.33 which is 2.4.
Try It
Find 1.66 – 0.84. Use models.
1. Model 1.66.
To show 1.66, shade one grid and sixty-six hundredths of a second grid.
Sixty-six hundredths is equal to 66 small squares.
Answer:
Sixty-six hundredths is equal to 66 small squares.
2. Subtract 0.84.
To subtract 0.84, cross out 4 hundredths and 8 tenths.
3. Count the remaining shaded squares.
How many ones are there? _____________
Answer:
There are zero ones.
How many tenths are there? _____________
Answer:
There are eight-tenths.
How many hundredths are there? _____________
Answer:
There are 2 hundredths.
So, 1.66 – 0.84 = 0.82.
Check Use addition to check your answer.
0.84 + _____________ = 1.66
Answer:
0.84 + 0.82 = 1.66.
Explanation:
To check the answer we will add 0.84+0.82 which is 1.66.
Talk About It
Question 1.
Mathematical PRACTICE Use Math Tools Explain how using models to find 2.4 – 1.07 is similar to using models to find 240 – 107.
Answer:
When we are using models to find the difference between the given numbers 2.4 and 1.07, we have to use model and take away the same number of squares as finding the difference between 240 and 107 using models.
Practice It
Subtract. Use decimal models.
Question 2.
0.93 – 0.7 = ____________
Answer:
0.93 – 0.7 = 0.23.
Explanation:
Given,
0.93 – 0.7
The subtraction for the given two numbers is 0.23.
Question 3.
1.53 – 1.41 = _____________
Answer:
1.53 – 1.41 = 0.12.
Explanation:
Given the equation is 1.53 – 1.41 which is 0.12.
The subtraction for the given two numbers is 0.12
Question 4.
0.9 – 0.3 = ______________
Answer:
0.9 – 0.3 = 0.6.
Explanation:
Given the equation is 0.9 – 0.3 which is 0.6.
The subtraction for the given two numbers is 0.6
Question 5.
3.94 – 0.4 = _______________
Answer:
3.94 – 0.4 = 3.54.
Explanation:
Given the equation is 3.94 – 0.4 which is 3.54.
The subtraction for the given two decimal numbers is 3.54.
Question 6.
3.55 – 0.1 = _______________
Answer:
3.55 – 0.1 = 3.45.
Explanation:
Given the equation is 3.55 – 0.1 which is 3.45.
The subtraction for the given two decimal numbers is 3.45.
Question 7.
2.4 – 0.9 = ________________
Answer:
2.4 – 0.9 = 1.5.
Explanation:
Given the equation is 2.4 – 0.9 which is 1.5.
The subtraction for the given two decimal numbers is 3.45.
McGraw Hill My Math Grade 5 Chapter 5 Lesson 9 My Homework Answer Key
Practice
Subtract. Use decimal models.
Question 1.
3.8 – 2.3 = ___________
Answer:
3.8 – 2.3 = 1.5.
Explanation:
Given the equation is 3.8 – 2.3 which is 1.5.
The subtraction for the given two decimal numbers is 1.5.
Question 2.
2.13 – 1.7 = ____________
Answer:
2.13 – 1.7 = 0.43.
Explanation:
Given the equation is 2.13 – 1.7 which is 0.43.
The subtraction for the given two decimal numbers is 1.5.
Problem Solving
Question 3.
Bridget is reviewing a nutrition label. She wants to find the difference between the amount of grams of saturated fat and protein. How many more grams are there of saturated fat than protein? Draw decimal models to find the difference.
Answer:
The saturated fat is 0.59 grams more than protein.
Explanation:
Given,
the amount of grams of saturated fat is 1.08 grams and protein is 0.49 grams.
So the difference between saturated fat and protein is 1.08-0.49 which is 0.59 grams.
Question 4.
Mathematical PRACTICE Use Math Tools Leanne is building a model tower that needs to be 1.42 meters tall. The model currently is only 0.68 meter tall. How many more meters does she need to build in order to finish the model tower? Draw decimal models to find the difference.
Answer:
Leanne needs 0.74 meters to build in order to finish the model tower.
Explanation:
Given Leanne is building a model tower that needs to be 1.42 meters tall and the model is currently 0.68 meters tall only.
So she needs 1.42-0.68 which is 0.74 meters to build in order to finish the model tower.