Determining the relationship between addition and subtraction is a first grade, Common COre math skills: 1.OA.3. Below we show two videos that demonstrate this standard. Then, we provide a breakdown of the specific steps in the videos to help you teach your class.
Your students should be familiar with the Kindergarten skill of understanding the number pairs that equal 10 and knowing all decompositions (e.g. 5=4+1, 5=2+3) of numbers below 10. This skill builds a foundation for strategy development, the understanding of place values, and properties of operations (K.OA.3-4). Your students should also understand that ten 1’s plus more 1’s are considered “teens” (K.NBT.1).
Understanding how to perform addition and subtraction within 20 will enable your students to perform similar skills up to 100, eventually extending those skills to work with larger numbers and solve two-step word problems (2.OA.1). They will also be able to apply this skill with problems in a variety of contexts involving length, picture graphs and bar graphs (2.NBT.5).
Common Core Standard: 1.OA.3 - Applying properties of operations as strategies to add and subtract
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 1.OA.3
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Adding and Subtracting Strategies
The video, narrated by the number 1 in a tie, starts by visualizing addition by counting yellow and blue rubber duckies. There are three blue ducks and seven yellow ducks, so 3 + 7 = 10 ducks. It then switches the order of the blue and yellow ducks and shows that the answer (10) is still the same.
Only in addition, there is the Commutative Property: The order of numbers can be switched as many times as you want and the answer remains the same.
The video then presents a series of practice math problems for your students to practice what they just learned. However, there is a mix of addition and subtraction.
Video 2: Adding and Subtracting Cupcakes
The video follows Jen as she tries to bake the proper number of cupcakes for herself and her friends. Knowing that 7 friends were coming, she baked 7 cupcakes, then she baked one more for herself. Boddle asks how many cupcakes she baked in total.
The situation is flipped, and Jen bakes one cupcake first and then 7 for her friends.
Later, Jen eats her cupcake before her friends arrive because she is hungry. The video asks how many cupcakes she has left.
The situation is reversed; this time all her friends eat their cupcakes, but she does not eat hers.
During the lesson, your students have made a Fact Family. A Fact Family is made of only 3 numbers: 8, 7, and 1. In the lesson, two addition and two subtraction equations are made.
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