Number sense and counting (T2 W9)
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Number sense refers to a person's ability to understand, interpret, 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 in different ways, such as counting forwards and backwards, and using skip counting. We will also discuss the importance of estimating and rounding numbers to make calculations easier.
Let's look at counting by 5s. If we start at 0, the sequence would be 0, 5, 10, 15, 20, and so on. To visualize this, we can use a number line. Each jump on the number line represents an increase of 5. Now, if we want to find out how many 5s are in 50, we can divide 50 by 5, which gives us 10. This means there are 10 groups of 5 in 50.
Now, let's practice skip counting together. I will say a number, and you will continue the sequence by skip counting by 10s. For example, if I say 30, you will say 40, 50, 60, and so on. After we complete this, we will write down the sequences on the board. This will help us visualize the patterns in numbers and reinforce our counting skills.
For your independent practice, I want you to solve the following problems in your exercise books. Remember to show your working clearly. 1. If you have 4 groups of 6 apples, how many apples do you have in total? 2. Count backwards from 50 in steps of 5. Write down the numbers you say. 3. Estimate the sum of 47 and 36 by rounding each number to the nearest ten before adding.
Answer: 40
The sequence is increasing by 10 each time.
Answer: 9
27 divided by 3 equals 9.
Answer: 40
Adding 25 and 15 gives us 40.
Answer: All of the above
All options show counting in increments.
Answer: 30, 27, 24, 21, 18, 15, 12, 9, 6, 3, 0
Counting backwards in steps of 3 from 30.
Answer: 50
50 is already at a ten, so it remains 50.
Answer: 20
5 times 4 equals 20.
Answer: 35
Subtracting 25 from 60 gives us 35.