Subtract within 100

randRange(1, 9) randRange(2, 9) randRange(1, B - 1)

A * 10 + B - C

\Large{A * 10 + B - C = ?}

\Large{= \pink{A}\blue{B} - \blue{C}}

\Large{= \pink{A * 10} + \blue{B} - \blue{C}}

\Large{= \pink{A * 10} + \blue{B - C}}

\Large{= \pink{A}\blue{B - C}}

randRange(2, 9) randRange(1, 9) randRange(1, A - 1)

A * 10 + B - C * 10

\Large{A * 10 + B - C * 10 = ?}

\Large{= \pink{A}\blue{B} - \pink{C * 10}}

\Large{= \pink{A * 10} + \blue{B} - \pink{C * 10}}

\Large{= \pink{A * 10} - \pink{C * 10} + \blue{B}}

\Large{= \pink{A * 10 - C * 10} + \blue{B}}

\Large{= \pink{A - C}\blue{B}}