Question

At a party, out of $9$ items on the table, $5$ are pizzas and 4 are burgers. Which of the following options have the equations of the fact family that can be created? (There can be multiple correct answers.)

• A. $4+5=9$ and $5+4=9$
• B. $5–4=9$ and $4–5=9$
• C. $9–4=5$ and $9–5=4$
• D. None of the above.

Answer 1

Answer: (A), (C)

$9–4=5$ and $9–5=4$

Say: Let's read the question.

Ask:
$\bullet$ What do we have to do here?
Ans: We need to frame two addition and subtraction equations for the total number of food items.
$\bullet$ How many food items are there in total?
Ans: $9$
$\bullet$ How many pizzas are there?
Ans: $5$
$\bullet$ How many burgers are there?
Ans: $4$
$\bullet$ How do we find the total?
Ans: By adding two smaller numbers to get a bigger number.
$\bullet$ Using the three numbers, i.e., $4,5,$ and $9$, what addition equations can be framed?
Ans: $4+5=9$ and $5+4=9$
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number from the bigger number.
$\bullet$ Using the three numbers, i.e., $4,5$, and $9$, what subtraction equations can be framed?
Ans: $9–5=4$ and $9–4=5$
Hence, Options A and B are correct.

WB: Use the whiteboard to represent the bigger number and check the smaller number as shown, and write the addition and subtraction equations.