Addition and subtraction (T4 W7)
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Addition is the process of finding the total or sum by combining two or more numbers. For example, if you have 3 apples and you get 2 more, you can add them together to find out how many apples you have in total: 3 + 2 = 5. Subtraction, on the other hand, is taking away a number from another. If you have 5 apples and you give away 2, you can find out how many you have left by subtracting: 5 - 2 = 3. Both operations are essential for solving everyday problems.
Let's look at an example: If Sarah has 4 balloons and her friend gives her 3 more, how many balloons does she have now? We can write this as an addition problem: 4 + 3. To solve it, we can count up from 4: 5, 6, 7. So, Sarah has 7 balloons in total.
Now, consider a subtraction example: If there are 8 cookies and 3 are eaten, how many cookies are left? We can write this as 8 - 3. To find the answer, we can count backwards from 8: 7, 6, 5. Therefore, there are 5 cookies left.
Let's practice together! If you have 6 toy cars and you buy 4 more, how many toy cars do you have now? Write the addition sentence and solve it. Remember to show your working! (6 + 4 = ?). After solving, we will discuss the different strategies you used to find the answer.
Now, let's try a subtraction problem. If you start with 10 stickers and you give away 3, how many stickers do you have left? Write the subtraction sentence and solve it. (10 - 3 = ?). We will share our answers and talk about how we arrived at them.
Now it's your turn to solve some problems on your own! Here are a few to try: 1. 5 + 7 = ? 2. 12 - 4 = ? 3. 9 + 6 = ? 4. 15 - 8 = ? Write down your answers and show your working. Once you finish, we will review your answers together and discuss any mistakes.
Answer: 8
When you add 3 and 5 together, you get 8.
Answer: 8
Subtracting 2 from 10 leaves you with 8.
Answer: 7
4 oranges plus 3 more equals 7 oranges.
Answer: 5
When you take away 1 from 6, you are left with 5.
Answer: 9
Adding 7 and 2 gives you a total of 9.
Answer: 10
Subtracting 5 from 15 results in 10.
Answer: 5
Eating 3 candies from 8 leaves you with 5.
Answer: 15
The total of 9 and 6 is 15.