The children explore with weight.  They use the different large dinosaurs on one side and try to first predict how many small dinosaurs it will take to find a balance.  The children then add dinosaurs to the lighter side to see if their predictions were correct.

The students use the dinosaur counters to put the correct number is each compartment.

On the bulletin board I have these addition activities stapled up.  In a small bag I have the answers written on a smoke shaped paper and the children velcro the smoke to the correct volcano.  To ensure success for this activity and to plan for the varying levels of learners I have drawn on dots under the number symbols and have demonstrated how children can conceptualize the addition concept.  The children then count the sets of dots all together.  This activity was from a Vera Trembach activity pack.

Another activity I used from Vera Trembach is a one to one correspondence book.  All of the answer bones are in an envelope in the back of the book.  The children take out the bones and match them to the correct number of dinosaurs on each page, I have them attached with velcro. 
 

To provide enrichment I have two sets of answers.  On one set of bones I have the number symbol and the number word.  On another set of bones I have the number words only and this gives the children who have mastered number recognition a little bit of a challenge.