Question

Out of a total of $7$ toys, $3$ are unicorns and the rest are talking ducks. Which of the following options shows the correct equations that can be created to form the fact family of the numbers $7,3$, and the number of talking ducks?

• A. $7–3=4,7–4=3,3+4=7,4+3=7$
• B. $4+3=7,7+3=10,4–3=1,3–2=1$
• C. $2+3=5,3+2=5,5–3=2,5–2=3$
• D. $7+3=4,3+7=4,3–7=4,3–4=7$

Answer 1

The correct option is A $7–3=4,7–4=3,3+4=7,4+3=7$

To find the number of talking ducks using a number frame, we first place $7$ counters for the total number of toys, then remove $3$ counters for the number of unicorns. We find that the number of talking ducks is $4$ and the equation framed is $7–3=4$.


And if we place $7$ counters first and remove $4$ later, the total counters will be $3$.
$7–4=3$


Similarly, if we place $3$ counters first and $4$ more later, the number of counters will be $7$.
$3+4=7$


And if we place $4$ counters first and $3$ more later, the number of counters will still be $7$.
$4+3=7$