# Effects Of Addition And Subtraction Of Whole Numbers

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- Understand the effects of adding and subtracting whole numbers.
- Understand various meanings of addition and subtraction of whole numbers and the relationship between the two operations.
- Develop and use strategies for whole-number computations, with a focus on addition and subtraction.
- Develop fluency with basic number combinations for addition and subtraction.

Essential Question(s):
- Numbers can be added in any way and we will still come up with the same answer
- Numbers cannot be subtracted in the same ways that addition can because then we will come up with a negative answer (explain that they do not need to know what negative is right now)

Established Objective(s): Students will be able to use a math strategy (i.e. the bunny …show more content…

Now, Peter the Rabbit has a special way of learning addition and subtraction problems and he calls it the bunny hop.”

Model:

Addition: Display a large number line and then demonstrate with Peter Rabbit on how a hop of 7 is taken on the number line. Encourage students to count aloud as the hop is made. Then make a hop of 3 starting at the place the Peter Rabbit landed. Encourage them to write the problem 7 + 3 = 10, or describe the problem this way: “If you take a hop of 7 spaces and then a hop of 3 spaces, you land on 10.”

Subtraction: Display a large number line and then demonstrate with Peter Rabbit on how a hop of 10 is taken and display the subtraction problem, 10 – 7 = ___. Encourage students to count aloud as each backward hop is made. Describe the problem this way “If you start at 10 and take 7 backward hops, you land on 3.”

Guided Practice:

Addition: Ask the students to take turns moving Peter Rabbit on the number line to find the sum shown in the example problems and record the hops in equation form, 7 + 3 = 10 or describe the problem this way: “If you take a hop of 7 spaces and then a hop of 3 spaces, you land on 10.” Encourage the students to predict the sums and to verify their predictions by moving a counter on the number