Question

A total of $16$ soft toys are required. 7 of them have been bought. How many more soft toys need to be bought?
$16–7=$ __, $7+$ __ $=16$

• A. $9$
• B. $8$
• C. $7$
• D. $10$

Answer 1

The correct option is A $9$

Say: Let us begin by finding the number of toys that are yet to be bought.

Ask:
$\bullet$ How many toys are required?
Ans: $16$
$\bullet$ How many are bought?
Ans: $7$
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number, i.e., $7$ from the bigger number, i.e., $16.$
$\bullet$ What equation will be framed?
Ans: $16–7=9$
$\bullet$ So, how many more toys need to be bought?
Ans: $9$

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.
$\bullet$ Using the same three numbers $7,9,$ and $16,$ $\bullet$ what addition equation can be framed?
Ans: $7+9=16$ or $9+7=16$

Hence, Option A 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: $16–7=9$
Addition equation: $7+9=16,9+7=16$

Q. Can any other related addition and subtraction equations be framed using the same numbers?
A. Yes.
Subtraction equation: $16–9=7$
Addition equation: $9+7=16$