Question

Fill in the blanks.

69 + 54 = 60 + ___ + 50 + ___

• A. 9, 4
• B. 4, 6
• C. 60, 50
• D. 69, 54

Answer 1

The correct option is A 9, 4

Say: On our screen, we have an incomplete equation.
Let us complete it.

Steps:

• The right side of the equation has 60 + ___ + 50 + ___
• Let us decompose 69 and 54.
• 69 = 60 + 9
• 54 = 50 + 4
• Therefore, 69 + 54 = 60 + 9 + 50 + 4
• Hence, option C is correct.

Probing question:
Q: Why do you think we decompose numbers to add them easily?
A: Decomposing them groups them into Tens and Ones, and it is easier for us to add them.