Skip to content
Brainsladder

Decompose 8

Students break the number 8 into two smaller parts in multiple ways, recording each decomposition with drawings, objects, or equations (e.g., 8 = 1 + 7, 8 = 2 + 6).

Try three of them

Real questions from this skill, graded here. No account, and nothing is saved.

Decompose 8

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

0 of 12

12 rungs. A star at the top.

4 + 4 =

How it is taught

0:00 of 1:58

Eight can be split into parts.

The parts add to eight.

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.

8 = 2 + ___ — 6. Count on from 2: 3, 4, 5, 6, 7, 8. That is 6.

8 = 5 + 3

Today we'll break the number eight into two smaller parts.

Here are eight dots. Let's look at them all together.

One, two, three, four, five, six, seven, eight. Eight in all!

Now let's split them into two groups — some on the left, some on the right.

The blue group has one, two, three, four, five. Five dots!

The green group has one, two, three. Three dots!

So eight is the same as five plus three.

Eight equals five plus three. We decomposed eight! There are other ways too — try finding them.

How can we break 8 apart?●●●●●●●●8 dots●●●●●●●●538=5+38 EQUALS5 + 3decomposed!
Kindergarten · Breaking 8 into two parts

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.

More of the library

Every skill has a page

Practise this skill free

14 days of every skill, practice packets, Fluency sheets and up to four students. No card.

Start free