Subtracting 3, 4, 5 digit numbers

Week 4 :Natalie and Karen

This is going to work a lot like subtracting with two digit numbers... 

639-275 Our first step is to stack and line

things up:

As usual, the first thing to do is to subtract the ones...  We don't have to do any

borrowing on this one:

639-275

Now, we'll subtract the tens stripe...  But, we run into that problem again!

639-275

We can’t subtract 7 from 3, since 7 is bigger than 3.

Subtract the tens...  Then, subtract the hundreds...

539-275364

OK, now we're ready to do one with TWO borrows in it!  And I'm going to use the faster way to show my work so you can get used to it.

Now let’s work through a few sample problems together

584-377

924-368

Lets work on word problems.

A word problem can have lots of information. You need to identify what information is available and determine what is it asking.

Let’s look at the first example:

Molly works at a women’s clothing store. Yesterday, she noticed that all her customers wore pants or skirts. 2 customers wore pants and 3 customers wore skirts. How many customers did Molly help yesterday. Circle your answer

3 4 5 2

Sara wrote 524 words in her journal. Then she crossed out 56 words and added 95 new words. a. How long was the entry after she crossed

out words? _______b. How long was the entry after she added new words? _______