Question

Observe the image below to complete the given equations. (There can be multiple correct answers.)


(i) $11+$ ____= ____
(ii) $18-$ ____ = ____

• A. (i) 7, 18; (ii) 11, 7
• B. (i) 8, 18; (ii) 11, 8
• C. (i) 7, 18; (ii) 7, 11
• D. (i) 7, 11; (ii) 11, 18

Answer 1

Answer: (A), (C)

(i) 7, 18; (ii) 7, 11

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

Ask:
$\bullet$ What do we have to do here?
Ans: We need to identify the related addition and subtraction equations for the given numbers.
Say: Let us begin by solving equation (i)

Ask:
$\bullet$ How do we find the total?
Ans: By adding two smaller numbers to get a bigger number.
$\bullet$ So, if we add the two parts, would that make a whole?
Ans: Yes
$\bullet$ What addition equations will we frame based on the given parts and the whole?
Ans: $11+7=18$ and $7+11=18$
$\bullet$ Which of these equations will help us complete equation (i), i.e., $11+$ __ = __?
Ans: $11+7=18$
Say: Now let us solve equation (ii)

Ask:
$\bullet$ How do we find the difference?
Ans: By subtracting the smaller number from the bigger number.
$\bullet$ So, can we subtract one part from the whole to find the other part?
Ans: Yes
$\bullet$ What subtraction equations will we frame based on the given parts and the whole?
Ans: $18–7=6$ and $18–11=7$
$\bullet$ Which of these equations will help us complete equation (ii), i.e., $18–$ __ = __?
Ans: Both equations can be used to complete equation (ii).

Hence, Options B and C are correct.
WB: If required, use the whiteboard to represent the bigger number and cross out the smaller number as shown, and write the subtraction equation.