Addition Concepts Copyright © Lynda Aguirre 2009.

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Presentation transcript:

Addition Concepts Copyright © Lynda Aguirre 2009

What does addition mean? Groups of objects are gathered altogether into one group and counted. Copyright © Lynda Aguirre 2009

How do you know it’s addition? Math words that mean addition: How many beans are there altogether? What’s the total number of beans? What is the sum of the beans? Copyright © Lynda Aguirre 2009

How do you do addition? How many beans are there in each of these groups? 1614 Copyright © Lynda Aguirre 2009

How do you do addition? How many beans are there altogether? =30 Copyright © Lynda Aguirre 2009

Subtraction Concepts Copyright © Lynda Aguirre 2009

What does subtraction mean? A certain number of objects are separated from the main group. There are 7 beans in this group. How many beans will be left if we take away 1 of these beans? Copyright © Lynda Aguirre 2009

What does subtraction mean? Objects are separated or taken away from the main group. Math words that mean subtraction: Math words that mean subtraction: Subtract (or Take Away) one. What’s the difference between 7 and 1? Seven minus one leaves how many beans? One Less than seven. Copyright © Lynda Aguirre 2009

7 – 1 = 6 How do you do subtraction? Original number of objects Number of objects taken away from the main group Number of objects left in the main group -= Copyright © Lynda Aguirre 2009