Addition and subtraction (T4 W7)
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Addition is the process of combining two or more numbers to find a total. For example, if you have 2 apples and you get 3 more, you can add them together to find out you have 5 apples in total. Subtraction, on the other hand, is taking away a number from another. If you have 5 apples and you give away 2, you subtract 2 from 5 to find out you have 3 apples left. We can use visual models like counters or drawings to help us understand these operations better.
Let's look at the problem: 4 + 3. We can use counters to visualize this. Start with 4 counters. Then, add 3 more counters. Count all the counters together: 1, 2, 3, 4, 5, 6, 7. So, 4 + 3 = 7. We can also write this as a number sentence: 4 + 3 = 7.
Now, let's solve a subtraction problem: 6 - 2. Start with 6 counters. If we take away 2 counters, we can remove them from our group. Count how many are left: 1, 2, 3, 4. So, 6 - 2 = 4. We can write this as a number sentence: 6 - 2 = 4.
Let's try this addition problem together: 5 + 2. Use your counters or draw circles to represent the numbers. Start with 5 and add 2 more. How many do you have in total? Count them together. Write down the number sentence and share it with your partner.
Now, let's work on a subtraction problem: 8 - 3. Start with 8 counters. Remove 3 counters and count how many are left. Write the number sentence and discuss your answer with your group. What did you find?
Now it's your turn to solve some problems on your own! Complete the following: 3 + 4 = ?, 7 - 5 = ?, 2 + 6 = ?, and 9 - 1 = ?. Show your work by drawing counters or writing number sentences. After you finish, check your answers with a friend and see if you can explain your thinking.
Answer: 5
When you add 2 and 3 together, you get 5.
Answer: 6
Subtracting 4 from 10 leaves you with 6.
Answer: 3
You subtract 2 from 5, which gives you 3 apples left.
Answer: 9
Adding 2 to 7 results in 9.
Answer: 5
When you take away 1 from 6, you have 5 left.
Answer: 8
Adding 4 and 4 together gives you 8.
Answer: 6
You subtract 3 from 9, which leaves you with 6 candies.
Answer: 3
Subtracting 2 from 5 results in 3.