Question

There are $14$ bottles of paint. After using a few bottles, only $7$ are left. How many bottles are used?
$14–7=$ __, $7+$ __ $=14$

• A. $9$ bottles; $9;9$
• B. $21$ bottles; $7;7$
• C. $7$ bottles; $7;7$
• D. $0$ bottles; $7;7$

Answer 1

The correct option is C $7$ bottles; $7;7$

Say: Let us begin by finding the number of bottles that are used.

Ask:
$\bullet$ How many bottles of paint are there?
Ans: $14$
$\bullet$ How many are left?
Ans: $7$
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number, i.e., $7$ from the bigger number, i.e., $14.$
$\bullet$ What equation will be framed?
Ans: $14–7=7$
$\bullet$ So, how many bottles are used?
Ans:$7$ bottles

Say: Now let's find the related addition equation.

Ask:
$\bullet$ How do you find the total?
Ans: By adding two smaller numbers to get a bigger number.
Using the same three numbers $7,7,$ and $14,$ what addition equation can be framed?
Ans: $7+7=14$

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 framed?
A. Subtraction equation: $14–7=7$
Addition equation: $7+7=14$