Measuring Lengths with a Square Block

Oct 13, 2025 by windailys.com 51 views

Introduction

In the previous chapter, we learned about fractions and their various types. Now, we will move on to a more advanced topic in mathematics, which is decimals. Decimals are a way of representing fractions with a denominator of 10 or a power of 10. In this chapter, we will learn how to measure lengths using a square block, which is a tool used to measure lengths in centimeters. We will also learn how to convert between fractions and decimals.

Measuring Lengths with a Square Block

A square block is a tool used to measure lengths in centimeters. It is a square-shaped block with a length of 1.4 cm. To measure a length using a square block, we need to count the number of blocks that fit into the length. For example, if we want to measure a length of 7.0 cm, we can use 5 blocks of 1.4 cm each, which will give us a total length of 7.0 cm.

Example 1: Measuring 7.0 cm

To measure 7.0 cm using a square block, we can use 5 blocks of 1.4 cm each. We can count the number of blocks that fit into the length by dividing the length by the length of each block.

length = 7.0 cm
block_length = 1.4 cm
number_of_blocks = length / block_length
print(number_of_blocks)

This will give us a total of 5 blocks, which is equal to 7.0 cm.

Example 2: Measuring 10.0 cm

To measure 10.0 cm using a square block, we can use 7 blocks of 1.4 cm each. We can count the number of blocks that fit into the length by dividing the length by the length of each block.

length = 10.0 cm
block_length = 1.4 cm
number_of_blocks = length / block_length
print(number_of_blocks)

This will give us a total of 7 blocks, which is equal to 10.0 cm.

Converting Between Fractions and Decimals

We can convert between fractions and decimals by dividing the numerator by the denominator. For example, if we want to convert the fraction 1/2 to a decimal, we can divide 1 by 2, which gives us 0.5.

Example 1: Converting 1/2 to a Decimal

To convert the fraction 1/2 to a decimal, we can divide 1 by 2.

numerator = 1
denominator = 2
decimal = numerator / denominator
print(decimal)

This will give us a decimal of 0.5.

Example 2: Converting 3/4 to a Decimal

To convert the fraction 3/4 to a decimal, we can divide 3 by 4.

numerator = 3
denominator = 4
decimal = numerator / denominator
print(decimal)

This will give us a decimal of 0.75.

Solving Problems with Tenths and Decimals

We can solve problems with tenths and decimals by using the same techniques that we use to solve problems with fractions. For example, if we want to find the sum of 2.5 and 1.8, we can add the two numbers together.

Example 1: Finding the Sum of 2.5 and 1.8

To find the sum of 2.5 and 1.8, we can add the two numbers together.

num1 = 2.5
num2 = 1.8
sum = num1 + num2
print(sum)

This will give us a sum of 4.3.

Example 2: Finding the Difference of 5.2 and 3.1

To find the difference of 5.2 and 3.1, we can subtract the two numbers.

num1 = 5.2
num2 = 3.1
difference = num1 - num2
print(difference)

This will give us a difference of 2.1.

Conclusion

In this chapter, we learned how to measure lengths using a square block, which is a tool used to measure lengths in centimeters. We also learned how to convert between fractions and decimals by dividing the numerator by the denominator. We can solve problems with tenths and decimals by using the same techniques that we use to solve problems with fractions. We can add, subtract, multiply, and divide tenths and decimals just like we do with fractions.

Key Takeaways

A square block is a tool used to measure lengths in centimeters.
We can measure lengths using a square block by counting the number of blocks that fit into the length.
We can convert between fractions and decimals by dividing the numerator by the denominator.
We can solve problems with tenths and decimals by using the same techniques that we use to solve problems with fractions.
We can add, subtract, multiply, and divide tenths and decimals just like we do with fractions.

Practice Problems

Measure the length of 12.0 cm using a square block.
Convert the fraction 2/3 to a decimal.
Find the sum of 4.5 and 2.1.
Find the difference of 6.8 and 3.4.
Measure the length of 9.0 cm using a square block.

Answers

9 blocks
0.67
6.6
3.4
6 blocks

Introduction

Q&A Session

Q: What is a square block?

A: A square block is a tool used to measure lengths in centimeters. It is a square-shaped block with a length of 1.4 cm.

Q: How do I measure a length using a square block?

A: To measure a length using a square block, you need to count the number of blocks that fit into the length. For example, if you want to measure a length of 7.0 cm, you can use 5 blocks of 1.4 cm each.

Q: How do I convert a fraction to a decimal?

A: To convert a fraction to a decimal, you need to divide the numerator by the denominator. For example, if you want to convert the fraction 1/2 to a decimal, you can divide 1 by 2, which gives you 0.5.

Q: How do I add two decimals together?

A: To add two decimals together, you need to line up the decimal points and add the numbers as you would with whole numbers. For example, if you want to find the sum of 2.5 and 1.8, you can add the two numbers together.

Q: How do I subtract two decimals?

A: To subtract two decimals, you need to line up the decimal points and subtract the numbers as you would with whole numbers. For example, if you want to find the difference of 5.2 and 3.1, you can subtract the two numbers.

Q: Can I multiply and divide decimals?

A: Yes, you can multiply and divide decimals just like you do with whole numbers. For example, if you want to multiply 2.5 by 3.1, you can multiply the two numbers together.

Q: What is the difference between a decimal and a fraction?

A: A decimal is a way of representing a fraction with a denominator of 10 or a power of 10. A fraction is a way of representing a part of a whole.

Q: Can I use a calculator to solve decimal problems?

A: Yes, you can use a calculator to solve decimal problems. However, it's always a good idea to check your work by hand to make sure you understand the problem.