facebook Composing & Decomposing Numbers Math Video | K, 1st & 2nd Grade
1%
Processing, please wait...
It was processed successfully!
Reading Material

Read About Composing & Decomposing Numbers

Download as PDF   Go Back to Lesson
WHAT IS COMPOSING & DECOMPOSING NUMBERS?

Composing means putting together. Decomposing means taking apart. You can decompose the numbers 11 – 19 into 10 and some more.

To better understand composing & decomposing…

WHAT IS COMPOSING & DECOMPOSING NUMBERS?. Composing means putting together. Decomposing means taking apart. You can decompose the numbers 11 – 19 into 10 and some more. To better understand composing & decomposing…

LET’S BREAK IT DOWN!

Decompose the number 13.

Decomposing means to take apart. You can decompose 13 into 10 and some more. 13 is 10 and 3 more.

Decompose the number 13. Decomposing means to take apart. You can decompose 13 into 10 and some more. 13 is 10 and 3 more.

Decompose the number 15.

There are 15 kittens in a pile. You can decompose 15 into 10 and some more. 15 is 10 and 5 more.

Decompose the number 15. There are 15 kittens in a pile. You can decompose 15 into 10 and some more. 15 is 10 and 5 more.

Use a ten frame to show 10 and some more.

You have 12 stickers. You put your stickers into ten frames. 10 stickers go into one ten frame. There are 2 stickers left. They go into another ten frame. 12 is 10 and some more.

Use a ten frame to show 10 and some more. You have 12 stickers. You put your stickers into ten frames. 10 stickers go into one ten frame. There are 2 stickers left. They go into another ten frame. 12 is 10 and some more.

Compose the number of bugs.

Composing means to put together. You have 10 bugs and 4 more bugs. You have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 bugs in all. 10 and 4 more is 14.

Compose the number of bugs. Composing means to put together. You have 10 bugs and 4 more bugs. You have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 bugs in all. 10 and 4 more is 14.

Compose the number of race cars.

You have 10 batteries and 9 more batteries. How many do you have in all? 10 batteries go in one 10 frame: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. 9 go in a second ten frame: 11, 12, 13, 14, 15, 16, 17, 18, 19. 10 and 9 more is 19.

Compose the number of race cars. You have 10 batteries and 9 more batteries. How many do you have in all? 10 batteries go in one 10 frame: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. 9 go in a second ten frame: 11, 12, 13, 14, 15, 16, 17, 18, 19. 10 and 9 more is 19.

COMPOSING & DECOMPOSING NUMBERS VOCABULARY

Break Apart
Split into parts. 17 can be broken apart into 10 and 7.
Join Together
Put together two or more parts. 6 and 10 can be put together to make 16.
Decompose
Break a number into parts. 13 can be decomposed into 10 and 3.
Ten Frame
A rectangle is divided into 10 equal parts that are used to represent numbers when counters or dots are placed in it.
Rectangle
A shape with 4 sides and 4 square corners.
Compose
Put a number together using its parts. 10 and 9 join together to compose the number 19.
A diagram that can show the composition and decomposition of numbers.
Says that two things are equal. 10 + 3 = 13.

COMPOSING & DECOMPOSING NUMBERS DISCUSSION QUESTIONS

X

Success

We’ve sent you an email with instructions how to reset your password.
Ok

Choose Your Free Trial Period

7 Days

7 days to access all our teaching resources for free.

Continue to Lessons

90 Days

Get 90 days free by inviting other teachers to try it too.

Share with Teachers

Get 90 Days Free

By inviting 4 other teachers to try it too.

4 required

Skip, I will use a 7 days free trial

Thank You!

Enjoy your free 90 days trial