1
Question
There are 18 balloons. The number of red and yellow balloons is equal, and there are no other balloons.
There are __ balloons of each color.
Identify the subtraction equation to find the number of balloons of each color and the addition equation with the same numbers that will help us find the total number of balloons.
There are 18 balloons. The number of red and yellow balloons is equal, and there are no other balloons.
There are __ balloons of each color.
Identify the subtraction equation to find the number of balloons of each color and the addition equation with the same numbers that will help us find the total number of balloons.
Open in App
Solution
The correct option is B 9 balloons; 9+9=18;18–9=9
Say: Let's read the question.
Ask:
∙ What do we have to do here?
Ans: We have to find the number of balloons of each color that are there.
∙ How many counters are there on the number frame?
Ans: 18
Say: Let's start by checking the counters from the number frame till we have an equal number of checked and unchecked counters.
Ask:
∙ How many counters did we check?
Ans: 9
∙ How many remain unchecked?
Ans: 9
∙ Can we say that we have an equal number of checked and unchecked counters?
Ans: Yes
∙ So, does that mean we now know the number of balloons of each color?
Ans: Yes
∙ So, how many balloons of each color are there?
Ans: There are 9 balloons of each color.
∙ What addition equation can be framed to find the total number of balloons?
Ans: 9+9=18
∙ How do we find the difference?
Ans: By subtracting the smaller number, i.e., 9 from the bigger number, i.e., 18.
∙ What equation will be framed?
Ans: 18–9=9
Hence, Option C is correct.
WB: If required, use the whiteboard to represent the bigger and smaller number as shown, and write the related addition and subtraction equations.
Probing Question:
Q. Is there another addition equation that can be framed, that adds up to 18 ?
A. 10+8=18
<All response from the student are acceptable.>
Q. Can this equation be used to solve the given problem?
A. No. Because the number of balloons must be equal, and in the equation 10+8=18, the number of balloons of one color is more than the other.
Say: Let's read the question.
Ask:
∙ What do we have to do here?
Ans: We have to find the number of balloons of each color that are there.
∙ How many counters are there on the number frame?
Ans: 18
Say: Let's start by checking the counters from the number frame till we have an equal number of checked and unchecked counters.
Ask:
∙ How many counters did we check?
Ans: 9
∙ How many remain unchecked?
Ans: 9
∙ Can we say that we have an equal number of checked and unchecked counters?
Ans: Yes
∙ So, does that mean we now know the number of balloons of each color?
Ans: Yes
∙ So, how many balloons of each color are there?
Ans: There are 9 balloons of each color.
∙ What addition equation can be framed to find the total number of balloons?
Ans: 9+9=18
∙ How do we find the difference?
Ans: By subtracting the smaller number, i.e., 9 from the bigger number, i.e., 18.
∙ What equation will be framed?
Ans: 18–9=9
Hence, Option C is correct.
WB: If required, use the whiteboard to represent the bigger and smaller number as shown, and write the related addition and subtraction equations.
Probing Question:
Q. Is there another addition equation that can be framed, that adds up to 18 ?
A. 10+8=18
<All response from the student are acceptable.>
Q. Can this equation be used to solve the given problem?
A. No. Because the number of balloons must be equal, and in the equation 10+8=18, the number of balloons of one color is more than the other.
Suggest Corrections
1
Join BYJU'S Learning Program
Join BYJU'S Learning Program
