Numbers up to 10 into pairs
Decompose numbers up to 10 into pairs in more than one way (part-part-whole)
What a learner can do afterwards
- Show that 5 = 1 + 4, 5 = 2 + 3, 5 = 0 + 5 etc.
- Use objects or drawings to find all pairs that make a given number
- Record decompositions as equations
The lesson
You know how to put two groups together. Now try the opposite: split one whole into two parts. The two parts always add up to the whole.
Mia has 6 apples. She makes two piles: 2 apples and 4 apples. Together, they still make 6.
There is more than one way to split a number. 5 can be 1 and 4, or 2 and 3. Check by adding the parts back together.
A number splits into two parts in more than one way. The parts always add back to the whole.
Watch it
Where it sits
This opens up
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.