Breaking Up Multiples of Ten!

When you break apart a multiple of ten, it can make multiplication so much easier! Why multiple by 50, when you can multiple by 5? Why multiply by 80, when you can multiply by8?! Let’s look at this quick lesson to see the three steps to breaking apart a multiple of ten:

  1. Break apart the multiple of ten.

  2. Multiply the two single digit factors.

  3. Multiply by ten.

Can you use this strategy on these problems?  5 x 40 = n.  7 x 90 = v.

To Multiply or Divide, that is the question!

Now that we know how to do complicated math like multiplying or dividing we tend to get stuck doing one skill or the other. Sometimes it’s time to multiply and sometimes it’s time to divide, but it’s not always one way or the other!

One tip is to notice the numbers given in the problem:

If the problem gives you a big number to be split apart by a little number- then it’s time to divide!

If the problem gives you two numbers to put together- then it’s time to multiply!

So, try these problems. Are we multiplying or dividing?

I have three friends and each friend has 11 freckles on her face! How many freckles do my friends have altogether?

I have 33 pencils and 3 friends. I want to split the pencils between my friends equally. How many pencils would each friend get?

Here’s our math talk problem. Visit the blog tomorrow to see who solved it perfectly!

I have 32 cookies and 4 friends. If each of my friends are super hungry, how many cookies will they get?