Mathematics - Term 4 - Week 5

Number sense refers to a person's ability to understand, interpret, and work with numbers. It includes skills such as recognizing numbers, understanding their relationships, and being able to manipulate them in various ways. For example, knowing that 10 is greater than 5 and being able to visualize this on a number line helps build a strong foundation in mathematics. This week, we will explore how to count in different ways, including skip counting and counting backwards, to strengthen our number sense.

Let's practice counting by 2s. Start from 0 and list the first ten numbers: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18. Notice how each number increases by 2. We can visualize this on a number line, where each point represents a number that is 2 units apart. This method of counting is useful in various situations, such as grouping items in pairs or understanding even numbers.

Now, let's practice skip counting together. I will write a sequence on the board, and you will help me fill in the blanks. For example, if I start with 5 and we are counting by 3s, the sequence would be 5, __, __, __. Students will fill in the blanks with 8, 11, and 14. After completing the sequence, we will discuss how skip counting can help us solve problems involving groups of items.

For your independent practice, solve the following problems on your own. Remember to show your working clearly. 1) Count backwards from 20 to 0 in steps of 2. 2) If you have 15 apples and you give away 3, how many do you have left? 3) Create a number line from 0 to 20 and mark the even numbers. After completing these tasks, review your answers and check for any mistakes.

• 7
• 8
• 9
• 10

Answer: 8

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

• 1, 2, 3, 4
• 5, 10, 15, 20
• 2, 4, 6, 8
• All of the above

Answer: All of the above

All options show sequences where numbers are counted in intervals.

Answer: Number sense is the ability to understand and work with numbers.

It includes recognizing numbers, understanding their relationships, and manipulating them.

• 5
• 6
• 4
• 3

Answer: 6

Counting backwards from 10 gives: 10, 9, 8, 7, 6.

Answer: There are 5 even numbers: 2, 4, 6, 8, 10.

Even numbers are multiples of 2.

• 15
• 12
• They are equal
• Cannot determine

Answer: 15

15 is greater than 12.

• 15
• 25
• 10
• 5

Answer: 15

Subtracting 5 from 20 gives you 15.

Answer: 5, 10, 15.

Multiples of 5 are obtained by multiplying 5 by whole numbers.