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Composing & Decomposing Numbers (1119)
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 How to break apart numbers between 11 and 19.
 How to join together numbers to make greater numbers.
 We'll explore how we can use this knowledge to help us count yarn balls for kittens, go on scavenger hunts, and play with cool toys!

Discussion Questions

Before VideoShow two ways to break apart 9 with pictures.ANSWER

4 and 5, 2 and 7.

A number bond with 7 on the top and 5 and 2 on the arms. A number bond with 7 on the top and 3 and 4 on the arms.

A drawing of 8 lines, then 2 more lines, labeled as 10 lines in all.

A number bond with 10 on the top and 1 and 9 on the arms.

8 = 3 + 5 or 3 + 5 = 8


After VideoShow 10 and 4 with counters in ten frames. Show the same number in a number bond.ANSWER

Two ten frames, one full and the other with 4 ones. A number bond with 14 on the top and 10 and 4 on the arms.

Two ten frames, one full and the other with 7 ones. 10 + 7 = 17.

Two ten frames, one full and the other with 8 ones. A number bond with 18 on the top and 10 and 8 on the arms.

Two ten frames, one full and the other with 2 ones. 10 + 2 = 12.

1 ten and 5 ones.



Vocabulary

Break Apart
DEFINE
Split into parts. 17 can be broken apart into 10 and 7.

Join Together
DEFINE
Put together two or more parts. 6 and 10 can be put together to make 16.

Decompose
DEFINE
Break a number into parts. 13 can be decomposed into 10 and 3.

Ten Frame
DEFINE
A rectangle is divided into 10 equal parts that are used to represent numbers when counters or dots are placed in it.

Rectangle
DEFINE
A shape with 4 sides and 4 square corners.

Compose
DEFINE
Put a number together using its parts. 10 and 9 join together to compose the number 19.

Number Bond
DEFINE
A diagram that can show the composition and decomposition of numbers.

Equation
DEFINE
Says that two things are equal. 10 + 3 = 13.

Break Apart
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageWHAT 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. 
Practice Word Problems

Practice Number Problems

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Science & Math$_{/yr}

Science Only$_{/yr}
Show 19 as 10 and some more in ten frames.
Write an equation that shows 16 as 10 and some more.
What does the 1 mean and what does the 9 mean in the number 19?
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