The ten times facts can form a basis for the nines and fives. Additionally, they are critical in multidigit multiplication later on.
There are a couple of tools that are useful for exploring the tens facts, but they really reinforce or explore the pattern of adding a zero when multiplying by 10.
I realized students don’t really know why we add a zero. The process looks something like this:
4 X 10 means 4 groups of 10. If we look at a place value chart: |
We place tens (or groups of ten) in the second column, which makes the number: | When we indicate the number of ones we have, we get: |
So why do we add a zero? Basically, because we have no units or singles. It’s all groups of ten.
A good visual tool is to use mini-ten frames. Students can use these to model a ten times fact and count by 10’s. | |
A hundreds board is a more abstract tool, but good for practicing the ten times facts and exploring the patterns. |
Hundreds Board | |
Mini Ten Frames (Full) |
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