Find the value of each difference. Show your thinking using drawings, numbers, or words.

1. \(60 - 5\)
2. \(76 - 9\)

Here is Mai’s work with a subtraction expression.

1. What subtraction expression does her diagram show?
2. What is the value of the expression?
3. Use Mai’s method. Find the value of \(51 - 9\).

Find the value of \(55 - 39\). Show your thinking using objects, drawings, numbers, or words.

Here is how Clare found the value of \(46 - 29\).

\(\begin{array}{l} 46 - 20 = 26 \\ 26 - 6 = 20\\ 20- 3 = 17\\ 46-29 = 17 \end{array}\)

Here is how Han found the value of \(46 - 29\).

How are Han’s and Clare’s calculations the same?

How are they different?

Find the value of each expression. Show your thinking using drawings, numbers, or words.

1. \(35 + 57\)
2. \(81 - 43\)

Here is Han’s method for finding the value of \(73 - 58\).

\(58 + 2 = 60\)
\(60 + 10 = 70\)
\(70 + 3 = 73\)
\(2 + 10 + 3 = 15\)

1. Show each step of Han’s work. Use base-ten blocks.

2. Why does Han’s method work? Explain your reasoning.

Here is Jada’s method for finding the value of \(73 - 58\).

\(73 - 60 = 13\)

\(13 + 2 = 15\)

1. Why does Jada’s method work? Explain your reasoning.
2. Use Jada’s method. Find the value of \(85 - 49\).