Question

Which two of the following groups of buckets represent the given addition equation? Find the missing number to complete the equation.

$\text{4 + 8 = \_\_\_}$

• A. Group 2 and group 3; Missing number: 9
  
• B. Group 1 and group 3; Missing number: 12
  
• C. Group 1; Missing number: 12
  
• D. Group 1 and group 2; Missing number: 13
  

Answer 1

The correct option is B Group 1 and group 3; Missing number: 12


Solution: Option D

Say: Let’s read the question and observe the image.

Ask:
How many buckets are there in Group $1$?
Ans: $8$
How many are there in Group $2$?
Ans: $5$
How many are there in Group $3$?
Ans: $4$
What numbers are given in the addition equation?
Ans: Both the addends, 4 and 8 are given.
Which two groups can represent the addends of the addition equation?
Ans: Groups $1$ and $3$
What is the total number of buckets combining both groups 1 and $3$?
Ans: $12$
What will be the complete addition equation?
Ans: $8+4=12$
Hence, option D is the correct answer.
WB: If required, use the whiteboard to draw the number frame and write the equation.



Probing Question:
Q. How will the addition equation be different if the buckets of groups $1$ and $2$, or groups $2$ and $3$ are combined together?
A: If groups $1$ and $2$ are combined, the addition equation will be $8+5=13$. For groups $2$ and $3$, the equation will be $5+4=9$.