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Composing & Decomposing Numbers (11-19)
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What you will learn from this videoWhat you will learn
- 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 Video
Show two ways to break apart 9 with pictures.ANSWER4 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 Video
Show 10 and 4 with counters in ten frames. Show the same number in a number bond.ANSWERTwo 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
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
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Level 1
Show 19 as 10 and some more in ten frames.
Level 2
Write an equation that shows 16 as 10 and some more.
Level 3
What does the 1 mean and what does the 9 mean in the number 19?
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