Count in 10s, 2s, 5s, 3s | Year 4 Mathematics PDF Download

How to count to 100

Here is a number grid from 1 to 100.
Look at the highlighted numbers. What do you notice?
Here are the numbers:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Each number is 10 more than the one before.

Examples

Example 1: Counting Books 
Here is a pile of 10 books.
Can you count in tens to find how many books there are in 4 piles?

Let's count them:
10, 20, 30, 40
You can see that there are 40 books in 4 piles of 10.
You can also write this as a repeated addition.
10 + 10 + 10 + 10 = 40

Example 2: A box of pencils holds 10 pencils.
Can you count in tens to work out how many there are in total?

Let's count them:
10, 20, 30, 40, 50, 60, 70
Through repeated addition this is:
10 + 10 + 10 + 10 + 10 + 10 + 10 = 70

Count in 2s

Example 1: Here is number 7 on a number track.

How much is 2 more than 7?
How much is 2 less than 7?
9 is 2 more than 7.5 is 2 less than 7.

Example 2: Here is number 16 on a number track.

Counting in pairs

There are 2 shoes in a pair.
Can you count how many shoes there are below?
Count them in twos:
2, 4, 6, 8, 10, 12, 14.

Remember

Instead of incrementally adding in twos, you can achieve the same result more efficiently by multiplying the number by 2. This method corresponds to the two times table.
For example, having 7 pairs of shoes can be calculated as:
7 x 2 = 14 shoes

Counting in 5s on a Number Grid

Below is a number grid starting from 1 and ending at 50.
Observe the highlighted numbers. What pattern do you see?The highlighted numbers are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.
Each number is 5 more than the previous one.

Examples

Example: All these flowers have 5 petals each.

• How many flowers are there?
  There are 5 flowers.
• How many petals are there?
  There are 25 petals in total.

Counting in 5s can help you determine the number of petals.

Remember

Counting in 5s helps you learn to multiply by 5.
So, 5 flowers with 5 petals each is the same as saying:
5 x 5 = 25 petals
Counting in 5s provides you with the 5 times table.

Counting in 3s

• Observing Dice: There are 4 dice, each displaying the number 3.

• Asking what 3 + 3 + 3 + 3 equals.
• Multiple methods can be used to find the answer.
• One way is to double the first two threes and then double them again.
• Another method involves counting up in threes.
• The correct answer is 12.

Using Cubes

Pattern with Cubes: Presenting different configurations of blocks, increasing in number.

Patterns and Numbers:

• Noting a pattern where the numbers increase by 3 each time.
• Examples include 3, 6, 9, 12.
• Illustrating how 3 + 3 + 3 + 3 equals 12.

Using Arrays

• Arrays are a way to organize elements in a specific order.
• An array can be visualized as a collection of items arranged in rows and columns.
• Counting in arrays can follow different patterns, such as counting in 3s from top to bottom or from left to right.
  

Counting on a Number Line

• A number line is a visual representation of numbers in order.
• Counting in 3s on a number line shows a repetitive pattern.
• Observing the number line can help identify the regular intervals between numbers.

Counting on Hands

• Counting on hands is a practical way to understand counting in 3s.
• By using fingers on hands, one can visualize multiples of 3 easily.
• After 30, the next multiples of 3 would be 33, 36, 39, and so on.
• Continuing the pattern of counting in 3s helps reinforce the concept of multiples.