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Decompose 9

Students break the number 9 into two smaller parts in multiple ways, recording each decomposition with drawings, objects, or equations (e.g., 9 = 1 + 8, 9 = 2 + 7).

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Decompose 9

Kindergarten · Decomposing Numbers and Making 10 · question 1 of 3

0 of 12

12 rungs. A star at the top.

4 + 5 =

How it is taught

0:00 of 2:01

Nine can be split into parts.

The parts add to nine.

Read it: 2 parts make 10

There are 10 crackers. 2 go on 1 tray and 8 on the other. 10 = 2 + 8.

  1. Put some on tray 1: 2.
  2. Count tray 2: 8.
  3. Say it: 10 = 2 + 8.

Moving crackers to another tray does not change how many there are.

So 2 on one tray and 8 on the other are still 10.

10 can be split in many ways: 1 and 9 is another one.

A number is 2 parts put together.

Thinking some crackers are gone when they move to the other tray.

Count both trays. 2 and 8 make 10.

9 = 3 + ___ — 6. Count on from 3: 4, 5, 6, 7, 8, 9. That is 6.

9 = 6 + 3

Today we'll break the number nine into two smaller parts. We call this decomposing.

Here are nine dots. Let's count them together: one, two, three, four, five, six, seven, eight, nine.

Can we split these nine dots into two groups? Let's try!

We'll put six dots on the left side. Watch them turn blue.

And the other three dots go on the right. Watch them turn green.

Now let's write what we did. Nine equals…

…six…

…plus…

…three!

Let's check. Six dots and three dots together make nine. It works!

Let's break 9 into two parts!Here are 9 dots●●●●●●●●●●●●●●●6●●●39=6+39 =6 + 3one way!
Kindergarten · Breaking 9 into two smaller parts

Nine equals six plus three. That's one way to decompose nine. Great job!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics
Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal
1 star — one skill mastered, every rung of its ladder climbed
Climbing now
Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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