Question

Out of $16$ birds, $7$ have long tails and the rest have short tails. Complete the given equation to find the number of birds with short tails, and answer which of the following equations is the same as the given equation.

$16–7=$ __

• A. $10,3+7=10$
• B. $9,9+6=16$
• C. $6,16–7=6$
• D. $9,7+9=16$

Answer 1

The correct option is D $9,7+9=16$

Total number of birds $=16$
Number of birds with long tails $=7$
Number of birds with short tails $=16–7$

On two number frames, if we place $16$ counters first and remove $7$ later, the counters left will be $9$.
Subtraction equation: $16–7=9$


On two number frames, if we place $7$ counters first and $9$ later, the total counters will be $16$.
Addition equation: $7+9=16$


Hence, Option C is correct, the number of birds with short tails is $9$ and the addition equation is $7+9=16$.