feat: examples

ex/theme-03-numbers-0-12/practice-03.md

@@ -2,6 +2,8 @@
 
 ### Exercise 7. Count and write
 
+Example: 🍎🍎 -> two
+
 1. ⭐ = __________
 2. 🚂🚂 = __________
 3. 🐟🐟🐟 = __________
@@ -9,6 +11,8 @@
 
 ### Exercise 8. Match
 
+Example: 1 -> b
+
 1. two
 2. four
 3. six
@@ -21,6 +25,8 @@ d. 4
 
 ### Exercise 9. Choose
 
+Example: apple / banana -> apple
+
 1. 5 = five / nine
 2. 6 = three / six
 3. 9 = nine / two