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First Grade CCSS Topic for August and September Operations & Algebraic Thinking Represent and solve problems involving addition and subtraction.

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## First Grade CCSS Topic for August and September Operations & Algebraic Thinking

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**First Grade CCSS Topic for August and September**Operations & Algebraic Thinking Represent and solve problems involving addition and subtraction. 1. Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. 1**Illustrative Math**Problems**There were 7 children at the park. Then 4 more showed up.**How many children were at the park all together? (total unknown)**There were 7 children at the park. Then 4 more showed up.**How many children were at the park all together? (total unknown)**7 + 4 = ____**There were 7 children at the park. Then 4 more showed up. How many children were at the park all together? (total unknown)**7 + 4 = __**There were 7 children at the park. Then 4 more showed up. How many children were at the park all together? (total unknown)**7 + 4 = 11**There were 7 children at the park. Then 4 more showed up. How many children were at the park all together? (total unknown)**There were 7 children at the park. Some more showed up.**Then there were 11 children in all. How many more children came to the park? (addend unknown)**7 + ___ = 11**There were 7 children at the park. Some more showed up. Then there were 11 children in all. How many more children came to the park? (addend unknown)**7 + __ = 11**There were 7 children at the park. Some more showed up. Then there were 11 children in all. How many more children came to the park? (addend unknown)**7 + 4 = 11**There were 7 children at the park. Some more showed up. Then there were 11 children in all. How many more children came to the park? (addend unknown)**There were some children at the park. Four more children**showed up. Then, there were 11 children at the park. How many children were at the park to start with? (unknown start addend)**There were some children at the park. Four more children**showed up. Then, there were 11 children at the park. How many children were at the park to start with? (unknown start addend)**__ + 4 = 11**There were some children at the park. Four more children showed up. Then, there were 11 children at the park. How many children were at the park to start with? (unknown start addend)**7 + 4 = 11**There were some children at the park. Four more children showed up. Then, there were 11 children at the park. How many children were at the park to start with? (unknown start addend)**There were 11 children at the park. How many can be boys**and how many can be girls? (both addends unknown)**There were 11 children at the park. How many can be boys**and how many can be girls? (both addends unknown)**There are 7 boys and 4 girls at the park. How many more**boys than girls are at the park? How many fewer girls than boys are at the park? (compare)**There are 7 boys and 4 girls at the park. How many more**boys than girls are at the park? How many fewer girls than boys are at the park? (compare)**7 – 4 = 3**There are 7 boys and 4 girls at the park. How many more boys than girls are at the park? How many fewer girls than boys are at the park? (compare)**There are 3 more boys than girls at the park. There are 4**girls at the park. How many children are at the park?**There are 3 more boys than girls at the park. There are 4**girls at the park. How many children are at the park?**There are 3 more boys than girls at the park. There are 4**girls at the park. How many children are at the park?**There are 3 more boys than girls at the park. There are 4**girls at the park. How many children are at the park?**4 + 7 = 11**There are 3 more boys than girls at the park. There are 4 girls at the park. How many children are at the park?

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