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Composing & Decomposing Numbers (11-19)
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- Show answers to discussion questions
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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!
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Discussion Questions
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Before VideoShow two ways to break apart 9 with pictures.ANSWER
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4 and 5, 2 and 7.
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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.
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A drawing of 8 lines, then 2 more lines, labeled as 10 lines in all.
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A number bond with 10 on the top and 1 and 9 on the arms.
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8 = 3 + 5 or 3 + 5 = 8
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After VideoShow 10 and 4 with counters in ten frames. Show the same number in a number bond.ANSWER
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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.
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Two ten frames, one full and the other with 7 ones. 10 + 7 = 17.
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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.
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Two ten frames, one full and the other with 2 ones. 10 + 2 = 12.
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1 ten and 5 ones.
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Vocabulary
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Break Apart
DEFINE
Split into parts. 17 can be broken apart into 10 and 7.
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Join Together
DEFINE
Put together two or more parts. 6 and 10 can be put together to make 16.
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Decompose
DEFINE
Break a number into parts. 13 can be decomposed into 10 and 3.
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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.
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Rectangle
DEFINE
A shape with 4 sides and 4 square corners.
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Compose
DEFINE
Put a number together using its parts. 10 and 9 join together to compose the number 19.
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Number Bond
DEFINE
A diagram that can show the composition and decomposition of numbers.
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Equation
DEFINE
Says that two things are equal. 10 + 3 = 13.
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Break Apart
DEFINE
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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
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Practice Number Problems
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Teacher Resources
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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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