Question

complete to solve $63 + 7$.
$63 + 7$
$= (60 + \square) + 7$
$= 60 + (\square + 7)$
$= 60 + \square$

Explanation:

Step1: Decompose 63

We know that \( 63 = 60 + 3 \), so the first blank is 3.
\( 63 + 7=(60 + 3)+7 \)

Step2: Apply associative property

Using the associative property of addition \( (a + b)+c=a+(b + c) \), we can rewrite the expression as \( 60+(3 + 7) \), so the second blank is 3.

Step3: Calculate \( 3 + 7 \)

Calculate \( 3+7 = 10 \), so the third blank is 10. Then \( 60 + 10=70 \), but we just need to fill the blanks as per the steps.

Answer:

First blank: \( 3 \), Second blank: \( 3 \), Third blank: \( 10 \)