why do I need to know this?

You may have to answer questions like these in your life some day

No idea what this is for... someone tell what this is for

If you need to answer the questions in your lifetime you'll straight away know the answer

am got the answers correct but it took me many tries to do it.

try your best and don't give up you got it

Hello, @29nbalas! You can easily find the answer using the distributive property: 9 × 15 = 9 × (10 + 5) = 9 × 10 + 9 × 5 = 90 + 45 = 100 + 35 = 135 I hope this helps!

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3rd grade

Course: 3rd grade > Unit 2

Lesson 7: 1-digit multiplication

1-digit multiplication: FAQ

Google Classroom

Frequently asked questions about 1-digit multiplication.

Why do I need to learn how to multiply by 1 or 0?

Multiplying by 1 or 0 is a great place to start when learning multiplication. It gives us the chance to understand the concept before moving on to more complicated numbers. Plus, knowing these simple rules can help us out in a pinch: anything multiplied by 1 stays the same, and anything multiplied by 0 is just 0.

Why is learning about the distributive property important?

The distributive property is a rule in math that says we can break a multiplication problem into two or more smaller problems, and then add the results together to get the same answer. This is helpful for multiplying larger numbers because it lets us break the problem down into smaller, more manageable chunks. For example, if we want to multiply 8, times, 12, we could use the distributive property to break it down like this: 8, times, 12, equals, left parenthesis, 8, times, 10, right parenthesis, plus, left parenthesis, 8, times, 2, right parenthesis, equals, 80, plus, 16, equals, 96

Where would we use multiplication in the real world?

There are endless places we might use multiplication in our everyday life! Here are just a few examples: figuring out how much we owe if we buy multiple items at a store, calculating the area of a room, or keeping score in some types of games.

How can we use skip counting to help when multiplying by doubles?

Skip counting can be really helpful when multiplying by doubles, or by any number really!

Here are a few examples:

When multiplying by 2, we can skip count by twos to get our answer. For example, if we want to find out what 2, times, 6 is, we can count by twos six times: 2, comma, 4, comma, 6, comma, 8, comma, 10, comma, 12. So 2, times, 6, equals, 12.
When multiplying by 4, we can skip count by fours. So to find out what 4, times, 7 is, we can count: 4, comma, 8, comma, 12, comma, 16, comma, 20, comma, 24, comma, 28. So 4, times, 7, equals, 28.

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am got the answers correct but it took me many tries to do it.
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Multiplication is not very hard for me, but I feel kind of confident about the unit test!
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29nbalas
Posted 8 days ago. Direct link to 29nbalas's post “9x15=?”
9x15=?
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- Leo Maykell
  Posted 6 days ago. Direct link to Leo Maykell's post “Hello, @29nbalas! You can...”
  Hello, @29nbalas! You can easily find the answer using the distributive property:
  
  9 × 15 =
  9 × (10 + 5) =
  9 × 10 + 9 × 5 =
  90 + 45 =
  100 + 35 =
  135
  
  I hope this helps!
  Comment on Leo Maykell's post “Hello, @29nbalas! You can...”
  (3 votes)