Question

There are $16$ flamingos. There are $9$ fewer kingfishers than flamingos. Complete the equations below to find the number of kingfishers. How many kingfishers are there?

(i) $16\square 9=$___
(ii) $9\square$__ = ___

• A. $\left(i\right)16+9=6;\left(ii\right)9-6=18;$ Kingfisher:$6$
• B. $\left(i\right)16-9=7;\left(ii\right)9+7=16;$ Kingfishers: $7$
• C. $\left(i\right)16+9=7;\left(ii\right)9-7=16;$ Kingfisher: $7$
• D. $\left(i\right)16-9=6;\left(ii\right)9+6=18;$ Kingfisher: $6$

Answer 1

The correct option is B $\left(i\right)16-9=7;\left(ii\right)9+7=16;$ Kingfishers: $7$

Say: Let's read the question, and observe the equations.

Ask:
$\bullet$ What do we have to do here?
Ans: We need to find the number of kingfishers.

Say: Let us begin by solving equation (i).

Ask:
$\bullet$ How do we find the difference?
Ans: By subtracting the number of kingfishers from the number of flamingos.
$\bullet$ How many flamingos are there?
Ans: $16$
$\bullet$ How many fewer kingfishers are there?
Ans: $9$
$\bullet$ So, what is the remaining number for which you subtract $9$ from $16,i.e.,16–9$ ?
Ans: $7$
$\bullet$ So, how many kingfishers are there?
Ans: $7$

Say: To complete the equation (i), we need to add a minus sign in the box between $16$ and $9,$ and write the difference, i.e., 7 to fill in the blank.

Ask:
$\bullet$ What is the complete equation (i) that is framed?
Ans: $16–9=7$

Say: Now let's solve equation (ii).

Ask:
$\bullet$ How do you find the total?
Ans: By adding the number of flamingos, i.e., $9$ and the number of kingfishers, i.e., $7.$

Say: To complete the equation (ii), we need to add a plus sign in the box after $9$, write the second addend, i.e., $7$ to fill in the first blank, and write the total, i.e., $16$ to fill in the second blank.

Ask:
$\bullet$ What is the complete equation (ii) that is framed?
Ans: $9+7=16$

Hence, Option C is correct.

WB: If required, use the whiteboard to represent the bigger and smaller number as shown, and write the subtraction equation.