Question

Ученики должны переплести 48 учебников.До обеда они переплели 20 учебников а после обеда -10.Сколько учебников осталось переплести? Реши задачу разными способами и объясни решение?

Answer 1

1)20+10=30(уч)переплели всего

2)48-30=18(уч)осталось

 

2способ

1)48-(20+10)=18(уч)осталось

Answer 2

10+20=30 учебников переплели всего

48-30=18 уч осталось переплести

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или выражением:

48-(10+20)=18 уч осталось переплести

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48-20=28 уч осталось переплести после обеда

28-10=18 уч всего осталось переплести

Answer 3

Task:

The students need to rebind 48 textbooks. Before lunch, they rebind 20 textbooks, and after lunch, they rebind -10. How many textbooks are left to rebind?

Solution:

There are a few ways to approach this problem. Let's explore a couple of methods to solve it.

Method 1: Using Addition and Subtraction

We can solve this problem by adding the number of textbooks rebound before lunch to the number rebound after lunch and then subtracting the total from the initial number of textbooks.

Step 1: Calculate the total textbooks rebound before and after lunch. - Textbooks rebound before lunch: 20 - Textbooks rebound after lunch: -10

Step 2: Add the textbooks rebound before and after lunch. - Total textbooks rebound = 20 + (-10) = 10

Step 3: Subtract the total textbooks rebound from the initial number of textbooks. - Initial number of textbooks = 48 - Textbooks left to rebind = 48 - 10 = 38

So, 38 textbooks are left to rebind.

Method 2: Using Direct Subtraction

Another way to solve this problem is by directly subtracting the textbooks rebound before and after lunch from the initial number of textbooks.

Step 1: Subtract the textbooks rebound before and after lunch from the initial number of textbooks. - Initial number of textbooks = 48 - Textbooks rebound before lunch = 20 - Textbooks rebound after lunch = -10

Step 2: Calculate the textbooks left to rebind. - Textbooks left to rebind = 48 - 20 - (-10) = 48 - 20 + 10 = 38

So, 38 textbooks are left to rebind using this method as well.

Both methods yield the same result, which is 38 textbooks left to rebind.

I hope this helps! If you have any further questions or need additional assistance, feel free to ask.