Addition and subtraction (T1 W3)
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Addition is when we combine two or more groups to find out how many there are in total. For example, if you have 2 apples and your friend gives you 3 more, you can find out how many apples you have by adding: 2 + 3 = 5. Subtraction, on the other hand, is when we take away from a group. If you have 5 apples and you eat 2, you can find out how many are left by subtracting: 5 - 2 = 3. Both operations are essential for solving everyday problems.
Let's look at an example: If you have 4 balloons and you get 2 more, how many balloons do you have now? We can write this as 4 + 2. To solve it, we count up from 4: 5, 6. So, 4 + 2 = 6. We can use a number line or draw balloons to visualize this addition.
Now, let's consider subtraction: If you have 7 candies and you give away 3, how many do you have left? We write this as 7 - 3. To solve it, we can count backwards from 7: 6, 5, 4. Therefore, 7 - 3 = 4. Using counters or drawing candies can help us see this clearly.
Let's practice some problems together. First, let's solve 3 + 5. We can use our fingers or draw dots to help us. Count 3 dots, then add 5 more. How many do we have? (Pause for responses.) Now, let's try a subtraction problem: 10 - 4. We can start at 10 and count backwards 4 steps. What do we get? (Encourage students to share their answers.)
Now it's your turn to solve some problems on your own! Here are a few for you to try: 1) 6 + 2 = ? 2) 9 - 5 = ? 3) 4 + 3 = ? 4) 8 - 2 = ? Write down your answers and show your working. Remember to check your work and see if you can find any mistakes!
Answer: 5
When you add 2 and 3 together, you get 5.
Answer: 8
Subtracting 2 from 10 leaves you with 8 apples.
Answer: 2
When you take away 3 from 5, you have 2 left.
Answer: 8
Adding 1 to 7 gives you 8.
Answer: 7
4 plus 3 equals 7 oranges.
Answer: 4
When you subtract 2 from 6, you get 4.
Answer: 7
Adding 3 and 4 gives you a total of 7.
Answer: 4
Giving away 1 candy from 5 leaves you with 4.