Question

Add using rods and units.
16 + 24 = __

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Say:
We will solve the given equation using rods and units. We will break down the number into Tens and Ones.

Steps:

• 16 is broken down into 1 Tens and 6 Ones, represented by 1 rod and 6 units.
• 24 is broken down into 2 Tens and 4 Ones, represented by 2 rods and 4 units.
• First, add the Ones, i.e., 6 + 4 = 10
• Next, add the Tens, 10 + 20 = 30
• Further, regroup and add the Tens and Ones, i.e., 30 + 10 = 40, represented by 4 rods.
• Hence, option D is correct.

WB: If required, use the whiteboard to break down the numbers and draw rods and units to solve the equation as shown.


Probing Question:
Q. What happens when there are 10 units?
A. As 10 Ones = 1 Ten 10 units = 1 rod.
So, when there are 10 units, they are combined to form a new rod.