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Thinking With
Numbers

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Level One - Addition

Strategies:

Partitions
Count Up
Use Doubles
Make Ten
Mental Math

An example of a "Count On To Add" five-minute lesson from above:

Problem:
Jack swam 26 laps in the pool and took a break. Later he swam 2 more laps. How many laps did Jack swim?

Connections: Highlight a count on explanation. Have all students try it with:

Suppose Jack swam 10 laps in the pool and later on he swam 2 more laps. How many laps did he swim in all?

Level One - Subtraction

Strategies:

Number Relationships
Count Back
Count Up
Use Ten
Mental Math

An example of a "Count Up To Subtract" five-minute lesson from above:

Problem:
At the zoo, there are 10 birds in a cage. When Mr. Steven's class counted the birds, they found only 9. How many birds were hiding?

Connections: Highlight an interesting strategy and have all students try it with:

There are 7 birds in a cage at the zoo. Mr. Steven's class only found 5. How many birds did the class not find?

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