Mathematics - Term 4 - Week 5

Number sense is the ability to understand and work with numbers. It involves recognizing numbers, understanding their relationships, and being able to manipulate them in various ways. In this lesson, we will explore how to count forwards and backwards, recognize patterns in numbers, and understand the value of each digit in a number. We will use visual aids such as number lines and ten frames to help illustrate these concepts.

Let's look at counting forward from 1 to 20. We can use a number line to visualize this. Starting at 1, we move to 2, then 3, and so on until we reach 20. Now, let's count backward from 20 to 1. We start at 20 and move down to 19, then 18, and continue until we reach 1. This practice helps us understand the sequence of numbers and prepares us for addition and subtraction.

Now, let's practice counting by 2s. Start at 0 and count together: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. Notice how we skip every other number. Can anyone tell me what the next number would be if we continued this pattern? (Expected answer: 22). Next, let's try counting by 5s. Start at 0: 0, 5, 10, 15, 20, 25. What do you notice about the numbers we land on? (Expected observation: They all end in 0 or 5).

Now it's your turn to solve some problems on your own. Here are a few questions: 1. What is 15 + 7? Show your working. 2. If you count backward from 30 to 10, how many numbers do you say? 3. Write down the numbers you would say if you counted by 3s from 0 to 30. Remember to show your working clearly and check your answers.

• 7
• 8
• 9
• 10

Answer: 8

The sequence is counting by 2s, so after 6 comes 8.

• 14
• 16
• 13
• 12

Answer: 14

14 is one less than 15, making it the correct answer.

Answer: 11

You say 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, which is 11 numbers.

• 12
• 15
• 20
• 10

Answer: 15

Adding 10 and 5 gives you 15.

Answer: 0, 5, 10, 15, 20

Counting by 5s starts at 0 and adds 5 each time.

• 18
• 12
• They are equal
• None of the above

Answer: 18

18 is greater than 12.

• 3
• 20
• 23
• 30

Answer: 20

The 3 in 23 represents 20 because it is in the tens place.

Answer: 6

The numbers are 0, 2, 4, 6, 8, 10, totaling 6 numbers.