lesson
Updated 1 month ago Β· 8 views
What is 10+4? You probably know right awayβit is 14! Adding any number to ten is super easy.
When we see a harder problem like 9+6, we can borrow a piece to build a ten first.
Can we turn tricky addition into an easy ten fact every single time?
Making Ten with 9
Look at 9+6. The number 9 is just 1 away from becoming a full ten.
We can decompose the number 6, which means breaking it into two smaller parts: 1 and 5.
πInteractive diagram
We give 1 to the 9 to make 10. Then we add the leftover 5 to get 10+5=15.
What if our starting number is 8 instead of 9?
Making Ten with 8
Let's solve 8+5. The number 8 needs 2 more friends to reach 10.
So we break the second addendβthe number we are addingβinto 2 and 3.
πInteractive diagram