All the solutions provided in McGraw Hill My Math Grade 5 Answer Key PDF Chapter 5 Lesson 4 Add Decimals Using Base-Ten Blocks will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 5 Answer Key Chapter 5 Lesson 4 Add Decimals Using Base-Ten Blocks
Build it
Ruben downloaded two ringtones to his cell phone. One cost him Si .30 and the other one was discounted to $0.50. How much did it cost for both ringtones?
Find $1.30 + $0.50. Use base-ten blocks.
1. Model 1.3 and 0.5
2. Combine the base-ten blocks. Draw the result.
How many tenths are there? __________
$1.30 + $0.50 = ___________
So, Ruben spent ____________ for both ringtones.
Answer:
8, $1.80.
Explanation:
There are 8 tenths are there.
$1.30 + $0.50 = $1.80
So, Ruben spent $1.80 for both ringtones.
Helpful Hint
3 tenths + 5 tenths = 8 tenths
Check: Use estimation to check for reasonableness.
$1+$1 = $2 and _____________ ≈ $2
Answer:
$1.80 ≈ $2.
Explanation:
Given,
$1.30 = $1 estimated value
$0.50 = $1 estimated value
$1 + $1 = $2
Try It
Find 1.42 + 0.87. Use base-ten blocks.
1. Model 1.42 and 0.87.
2. Combine the base-ten blocks.
Since there are 12 tenths, you need to regroup. You can regroup 12 tenths as 1 whole and 2 tenths. Draw the result.
How many ones are there? _____________
How many tenths are there? _____________
How many hundredths are there? _____________
So, 1.42 + 0.87 = _____________.
Check Use estimation to check for reasonableness.
1 + 1 = 2 and _____________ ≈ 2
Answer:
There are 2 ones.
There are 2 tenths.
There are 9 hundredths.
So, 1.42 + 0.87 = 2.29
1 + 1 = 2
2.29 ≈ 2
Explanation:
Talk About It
Question 1.
Mathematical PRACTICE Reason How is adding decimals similar to adding whole numbers?
Answer:
Adding decimal numbers with a decimal point is just like adding and subtracting the whole numbers. In this the only difference is that we line up the numbers according to the decimal point.
Practice It
Add. Use base-ten blocks. Draw each result in the table.
Question 2.
0.3 + 0.4 = ____________
Answer:
0.7
Explanation:
The addition to the given numbers 0.3 + 0.4 = 0.7
let us see the result in the table.
Question 3.
2.4 + 0.5 = ____________
Answer:
2.9
Explanation:
Question 4.
1.52 + 0.37 = ____________
Answer:
1.89
Explanation:
Question 5.
3.71 + 1.53 = ____________
Answer:
5.24
Explanation:
Question 6.
1.2 + 0.9 = ____________
Answer:
2.1
Explanation:
Question 7.
2.71 + 0.45 = ____________
Answer:
3.16
Explanation:
Apply It
Question 8.
Mathematical PRACTICE Use Math Tools Nathan ran 2.35 miles on Tuesday and 3.15 miles on Thursday. What total distance did he run? Use base-ten blocks to help you solve.
Answer:
5.5 miles.
Explanation:
Nathan ran 2.35 miles on Tuesday.
Nathan ran 3.15 miles on Thursday.
Total distance is 2.35 + 3.15 = 5.5 miles.
Question 9.
Valerie had $1.87 in her bank at home. She adds $2.67 in change. How much does she have now?
Answer:
$4.54
Explanation:
Given,
Valerie had $1.87 in her bank at home.
She adds $2.67 in change.
Total she had = $1.87 + $2.67 = $4.54
Question 10.
Mathematical PRACTICE Find the Error Tom used base-ten blocks to find 1.72 + 1.77. Find his mistake and circle the correct sum.
Which is the correct sum?
2.29 3.14
3.29 3.49
Answer:
3.49 is the correct sum.
Explanation:
Write About it
Question 11.
How can you use base-ten blocks to add decimals?
Answer:
The set of blocks with a hundred squares is called one whole unit. The set of blocks with ten blocks represents one-tenth because we need ten of these to make a whole unit. The one with only one block is called the one hundredth.
McGraw Hill My Math Grade 5 Chapter 5 Lesson 4 My Homework Answer Key
Practice
Add. Use base-ten blocks. Draw each result in the table.
Question 1.
1.83 + 0.36 = ___________
Answer:
2.19
Explanation:
The addition of given two numbers is 2.19. And the each result in the table.
Question 2.
3.1 + 1.34 = _____________
Answer:
4.44
Explanation:
Problem Solving
Question 3.
Lucas had 2.3 pounds of grapes left over from his class party. The class ate 1.9 pounds of the grapes. How many pounds of grapes did Lucas buy? Use models to find the sum.
Answer:
4.2 pounds of grapes.
Explanation:
Given,
Lucas had 2.3 pounds of grapes left over from his class party.
The class ate 1.9 pounds of the grapes.
Total = 2.3 + 1.9 = 4.2 pounds of grass.
Question 4.
Mathematical PRACTICE Justify Conclusions Janice wanted to download the following items for her cell phone: A ringtone for $3.10, a picture for $1.95 and a game for $2.05. She has $8. Not including tax, does Janice have enough money to buy all three items? Explain.
Answer:
Yes, Janice have enough money to buy all three items.
Explanation:
Given,
Janice downloaded a ringtone for $3.10.
Janice downloaded a picture for $1.95.
Janice downloaded a game for $1.95.
Total amount = $3.10 + $1.95 + $1.95 =7.10
So Janice has $0.90 left.
Question 5.
Kelli had $0.55 in her pocket to buy a snack after school. Renee had $1.64 in her pocket. They decided to share a snack. How much can they spend on a snack altogether? Use models.
Answer:
$2.19
Explanation:
Given,
Kelli had $0.55 in her pocket to buy a snack after school.
Renee had $1.64 in her pocket.
Add both of them
$0.55 + $1.64 = $2.19 they spent on a snack altogether.