Hiding Counters

Warm Up Draw an array outside (4 x 4) Explain that arrays must have equal numbers in rows and columns. {...}

You have $6. 40 in your pocket.  What notes or coins could it be?  Can you show 3 different ways{...}

You are the designer of a chocolate company.  Pick a number 8, 12, 16, 20, 24, 36, 48, 56 How{...}