Question

There are $17$ medals to be given. $9$ have already been given. How many medals are yet to be given? Identify the addition and subtraction equations that represent the problem.

• A. $7;9+7=16,16–9=7$
• B. $9;9+9=17,17–9=9$
• C. $8;17–9=8,9+8=17$
• D. $10;10+7=17,17–7=10$

Answer 1

The correct option is C $8;17–9=8,9+8=17$

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

Ask:
$\bullet$ How many medals are to be given?
Ans: $17$
$\bullet$ How many are already given?
Ans: $9$
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number, i.e., $9$ from the bigger number, i.e., $17.$
$\bullet$ What equation will be framed?
Ans: $17–9=8$
$\bullet$ So, how many medals are yet to be given?
Ans: $8$

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 $8,9,$ and $17,$ what addition equation can be framed?
Ans: $9+8=17$ or $8+9=17$
$\bullet$ Which of these equations is used in the given options?
Ans: $9+8=17$
$\bullet$ Which option shows us the number of medals yet to be given, and the addition and subtraction equations used to represent the problem?
Ans: Option C

Hence, Option C 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.