Question

A box has $6$ chocolate cookies and twice as many butter cookies than chocolate cookies.
There are __ butter cookies in the box.
Identify the addition and subtraction equations.

• A. $12;12+6=18;6+12=18,18–6=12,18–12=6$
• B. $12;12+6=18,6+12=18,18–6=12,6–18=12$
• C. $18;18–6=12,18–12=6,18+6=24,6+18=24$
• D. $6;6+6=12,6+6=12,12–6=6,6–12=6$

Answer 1

The correct option is A $12;12+6=18;6+12=18,18–6=12,18–12=6$

Say: Let's read the question.

Ask:
$\bullet$ What do we have to do here?
Ans: We need to identify the number of butter cookies, and then identify the related addition and subtraction equations for the total number of cookies in the box.

Say: Let us begin by finding the number of butter cookies.

Ask:
$\bullet$ How many chocolates are there?
Ans: $6$
$\bullet$ How many butter cookies are there?
Ans: Twice as many as the chocolate cookies.
$\bullet$ How much is twice as much as 6?
Ans: $12$
$\bullet$ How did we find this?
Ans: By adding 6 two times, i.e., $6+6=12$
$\bullet$ So, how many butter cookies are there?
Ans: $12$

Say: Now let us identify the related addition and subtraction equations for the total number of cookies in the box.

Ask:
$\bullet$ How many chocolate cookies are there?
Ans: $6$
$\bullet$ How many butter cookies are there?
Ans: $12$
$\bullet$ What are the two addition equations that can be framed to find the total number of cookies?
Ans: $12+6=18$ and $6+12=18$
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number from the bigger number.
$\bullet$ Using the same three numbers, i.e., $6,12,$ and $18,$ what subtraction equation can be framed?
Ans: $18–6=12$ and $18–12=6$

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. So, what are the related addition and subtraction equations that are framed?
A. Addition equations: $12+6=18$ and $6+12=18$
Subtraction equations: $18–6=12$ and $18–12=6$