Question

Observe the image below to form an addition equation with a missing addend. What is the missing addend?

Answer 1

Say: Let's read the question and observe the given number frames.

Ask:
\(\bullet\) What do we have to do here?
Ans: We need to identify the missing addend, and complete the equation.
\(\bullet\) In all, how many counters are there on the number frame?
Ans: \(17\)
\(\bullet\) How many counters have been crossed out?
Ans: \(9\)
\(\bullet\) How many counters are remaining?
Ans: \(8\)
\(\bullet\) What equation can be framed?
\(17 – 9 = 8\)
\(\bullet\) Using the same three numbers \(8, 9,\) and \(17,\) \(\bullet\) what addition equations can be framed?
Ans: \(8 + 9 = 17\) and \(9 + 8 = 17\)
\(\bullet\) Based on the given options, which equation is correct?
Ans: \(8 + 9 = 17\)
\(\bullet\) What is the missing addend in the equation?
Ans: \(9\)

Hence, Option A is 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.

Probing Question:
Q. Can we frame an addition equation from a subtraction equation?
A. Yes, as addition and subtraction are opposite of each other, we can create an addition equation from a subtraction equation.