Subtracting Numbers Within 100

 
Here's another one:

76-41

Stack the numbers and line things up in stripes:

76-41

Subtract down the stripes...

First, subtract
the ones:

subtracting the ones for 76-41

 Then, subtract the tens:


subtracting the tens for 76-41

That's really

70-40=30

So, 76-41=35

Here are some problems to practice.  Be sure to get really good at these before going to the next lesson.  You don't have to do ALL of them...  Just do as many as you need to until they feel easy.

1)  38-17   9)  39-27
2)  56-21 10)  52-31
3)  88-42 11)  73-52
4)  81-50 12)  97-64
5)  45-32 13)  89-69
6)  95-72 14)  83-41
7)  59-37 15)  43-22
8)  63-12 16)  66-13

 
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