Is 23 prime or composite? how you know.

\begin{tabular}{l} Find the LCM (least common multiple) of 2,10 , and 6. \\ A. 2 \\ B. 30 \\ C. 60 \\ D. 120 \\ E. 1 \\ \hline\end{tabular}

What is the least common multiple of 10 and 15 ? A. 5 B. 25 C. 30 D. 60 E. 150

The length of a piece of ribbon is 250 millimeters. Which is the equivalent length in meters? \[ \begin{array}{l}\text { A. } 25 \mathrm{~m} \\ \text { D. } 2.5 \mathrm{~m} \\ 0.25 \mathrm{~m}\end{array} .025 \mathrm{~m} \] E. 0.0025 m

b) Anne-Marie calculates the clearance between a fridge door and its open position ( \( 27 \frac{1}{2} \) "), and the countertop across from the fridge \( 32^{\prime \prime} \) away. She wants to know the difference between the two?

\( 2 + ( - \frac { 11 } { 3 } ) ; \quad - \frac { 1 } { 4 } - ( - \frac { 5 } { 6 } ) - 3 \)