Mathematics - Term 4 - Week 7

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 find the total by adding: 3 + 2 = 5 apples. Subtraction, on the other hand, is taking away a number from another. If you have 5 apples and you give away 2, you subtract: 5 - 2 = 3 apples. Both operations are fundamental in mathematics and are often used in everyday situations.

Let's solve the problem: 4 + 3. We can visualize this using counters. If we have 4 counters and add 3 more, we can count all the counters together. Starting from 4, we count up: 5, 6, 7. So, 4 + 3 = 7. Now, let’s look at a subtraction example: 10 - 6. If we have 10 counters and take away 6, we count down: 9, 8, 7, 6, 5, 4. We are left with 4 counters, so 10 - 6 = 4.

Now, let's work on some problems together. First, try this addition problem: 6 + 5. Use your fingers or counters to help you. Count up from 6: 7, 8, 9, 10, 11. So, 6 + 5 = 11. Next, let's do a subtraction problem: 12 - 4. Start with 12 and count down: 11, 10, 9, 8. Therefore, 12 - 4 = 8. Discuss your strategies with a partner and share how you arrived at your answers.

Now it's your turn to solve some problems independently. Write down your answers and show your working. Here are your problems: 1) 7 + 2 = ? 2) 15 - 5 = ? 3) 9 + 6 = ? 4) 20 - 8 = ? After you finish, check your answers with a partner and discuss any mistakes you made and how you can correct them.

• 7
• 8
• 9
• 6

Answer: 8

When you add 5 and 3 together, you get 8.

• 5
• 6
• 7
• 4

Answer: 6

Subtracting 4 from 10 leaves you with 6.

Answer: 15

Adding 8 and 7 gives a total of 15.

Answer: 5

When you take away 9 from 14, you are left with 5.

• 8
• 9
• 10
• 7

Answer: 9

The sum of 3 and 6 is 9.

• 10
• 11
• 12
• 9

Answer: 11

Subtracting 7 from 18 results in 11.

Answer: 10

Adding 5 and 5 equals 10.

Answer: 5

When you subtract 15 from 20, you get 5.