Question

complete to solve 48 + 13.
48 + 13
= 48 + (□ + 11)
= (48+□) + 11
= □ + 11
= □

Explanation:

Step1: Decompose 13

We know that \(13 = 2 + 11\), so we fill the first box with 2.
\(48 + 13 = 48+(2 + 11)\)

Step2: Apply associative property

Using the associative property of addition \((a + b)+c = a+(b + c)\), we can rewrite the expression as \((48 + 2)+11\). So the second box is also 2.
\(=(48 + 2)+11\)

Step3: Calculate 48 + 2

Calculate \(48+2 = 50\). So the third box is 50.
\(= 50+11\)

Step4: Calculate 50 + 11

Calculate \(50 + 11=61\). So the fourth box is 61.
\(= 61\)

Answer:

The first box: \(2\), the second box: \(2\), the third box: \(50\), the fourth box: \(61\) (And the final result of \(48 + 13\) is \(61\))