Know Your 5s Facts by Doing This…

So recently I discovered that the 6s multiplication facts multiplied by an even factor have a repeating pattern in the tens place.  This made me rethink the 5s multiplication facts.  Could there be patterns there, too?   Here are the 5s multiplied by even numbers.  Well, tell me what you think. 

I see that the facts all end in zeros and the tens place is half of one of the factors.  Is there anything else?

Here are the 5s multiplied by odd factors.

Now for students who count on their fingers for their 5s this is another tool that could help them arrive at the answer faster than counting by 5s on their fingers.

I notice that the 5s multiplied by odd factors always have a 5 in the ones place.  Now is there a way you could describe the pattern in the tens place? Hmmmmm….I don’t know.  What do you think?  Do you have any strategies for making 5s easier for kids to learn?

And finally, here is a question you could pose to children.  How can knowing your tens facts help you learn your 5s facts?