$1/$2 coins and notes

Worked solution

1. 1

   Count the two-dollar coin first.

   $2\text{dollars}$

   The value written on this coin is two dollars, although it is only one coin.

2. 2

   Add the two one-dollar coins.

   $2+1+1=4$

   Each smaller-value coin adds one dollar, making four dollars in the purse.

Worked solution

1. 1

   Use only two-dollar coins for one way.

   $2+2+2=6$

   Three coins worth two dollars each make six dollars.

2. 2

   Exchange one two-dollar coin for two one-dollar coins.

   $2=1+1$

   The exchange changes the coins but keeps their value the same.

3. 3

   Check the second collection.

   $2+2+1+1=6$

   Two two-dollar coins and two one-dollar coins also make six dollars.