Number sense and counting (T2 W9)
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Number sense refers to the ability to understand, relate, and connect numbers in a meaningful way. It involves recognizing the size of numbers, understanding their relationships, and being able to manipulate them in various contexts. This week, we will explore how to count effectively, recognize patterns in numbers, and use these skills to solve problems. We will also discuss the importance of estimation and how it can help us check our work.
Let's consider the number 24. We can represent this using a ten-frame model. In the first ten-frame, we fill all ten boxes, and in the second frame, we fill four boxes. This visual representation helps us see that 24 is made up of 2 tens and 4 ones. By using models like this, we can better understand how numbers are constructed and how to manipulate them in calculations.
In small groups, discuss the following problem: 'If you have 15 apples and you give away 7, how many do you have left?' Use a number line to visualize the problem. Each group will share their approach and reasoning. This activity encourages students to articulate their thought processes and learn from each other. After discussing, we will collectively solve the problem on the board, ensuring everyone understands the steps involved.
Now it's your turn to practice independently. Solve the following problems on your own: 1) What is 32 + 19? 2) If you have 50 candies and you eat 23, how many are left? 3) Write down the numbers from 1 to 50 and circle all the even numbers. Show your working for the addition and subtraction problems. After completing the exercises, review your answers with a partner and discuss any mistakes.
Answer: 82
45 + 37 equals 82.
Answer: 34
34 is even because it can be divided by 2 without a remainder.
Answer: 35
60 - 25 equals 35.
Answer: 36
12 times 3 equals 36.
Answer: 53
100 - 47 equals 53.
Answer: 87
87 is greater than 78.
Answer: 2, 3, 5, 7, 11
Prime numbers are numbers greater than 1 that have no divisors other than 1 and themselves.
Answer: 10
The sequence increases by 2 each time.