Mathematics - Term 3 - Week 9

Addition is the process of combining two or more numbers to find a total, while subtraction is taking one number away from another. For example, if you have 5 apples and you get 3 more, you can add them together: 5 + 3 = 8. In contrast, if you have 8 apples and give away 3, you subtract: 8 - 3 = 5. Visual models like number lines or counters can help us see these operations more clearly.

Let's solve 7 + 4 using counters. If we have 7 counters and add 4 more, we can count all the counters together. Start with 7, then count up 4 more: 8, 9, 10, 11. So, 7 + 4 = 11. We can also check this using a number line by jumping forward 4 spaces from 7.

Now, let's look at 10 - 6. We can use a number line for this too. Start at 10 and jump back 6 spaces: 9, 8, 7, 6, 5, 4. We land on 4, so 10 - 6 = 4. This shows how subtraction takes away from the total.

Let's work on these problems as a class. First, try 6 + 5. Use your fingers or counters to find the answer. After that, let's solve 12 - 3 together. Remember to show your working! Discuss your strategies with a partner. How did you arrive at your answers? This will help reinforce your understanding.

Now it's your turn! Solve the following problems independently: 9 + 7, 15 - 4, 8 + 6, and 14 - 5. Make sure to write down your working steps clearly. After you finish, check your answers with a partner and discuss any mistakes you might have made. Remember, mistakes are a great way to learn!

• 7
• 8
• 9
• 6

Answer: 8

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

• 6
• 5
• 7
• 8

Answer: 6

Subtracting 4 from 10 gives you 6.

Answer: 9

Adding 7 and 2 results in 9.

Answer: 8

When you take 5 away from 13, you are left with 8.

• 10
• 12
• 11
• 13

Answer: 12

Adding 6 and 6 equals 12.

• 11
• 10
• 12
• 13

Answer: 11

Subtracting 9 from 20 gives you 11.

Answer: 8

Adding 4 and 4 results in 8.

Answer: 6

When you subtract 3 from 9, you get 6.