Number sense and counting (T3 W7)
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Number sense is the ability to understand, relate, and connect numbers. It involves recognizing numbers in different forms, such as whole numbers, fractions, and decimals. In this lesson, we will explore how to count in various ways, including skip counting and counting backwards. We will also discuss the importance of estimating and comparing numbers to enhance our number sense.
Let's practice skip counting by 5s. Start from 0 and count: 0, 5, 10, 15, 20, 25, 30. Notice how we add 5 each time. This method helps us quickly find larger numbers and is useful in real-life situations, like counting money. For example, if you have 3 five-rand coins, you can count them as 5, 10, 15.
Now, let's practice counting backwards from 30 to 0. I will start: 30, 29, 28... Now it's your turn! Count backwards in groups of 2. Remember to say each number clearly. This exercise helps us understand subtraction and prepares us for more complex calculations.
Solve the following problems on your own. 1. If you skip count by 10s starting from 10, what are the first five numbers you will say? 2. If you have 25 apples and give away 7, how many do you have left? Show your working clearly. Remember to check your answers and correct any mistakes.
Answer: 20
The sequence is increasing by 5 each time, so the next number is 15 + 5 = 20.
Answer: 10, 9, 8, 7
Counting backwards means decreasing the numbers, as shown in the option 10, 9, 8, 7.
Answer: 0, 3, 6, 9
Skip counting by 3s means adding 3 each time: 0 + 3 = 3, 3 + 3 = 6, 6 + 3 = 9.
Answer: 18
Subtracting 7 from 25 gives us 18.
Answer: 54
54 is greater than 45.
Answer: 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
Counting backwards from 10 means listing each number in descending order until reaching 0.
Answer: 20
30 - 10 equals 20.
Answer: 4, 8, 12
The first three multiples of 4 are obtained by multiplying 4 by 1, 2, and 3.