Grace is the Unchanged Identity – The number of stamps Grace had will not change. This is also “Before-After” question as something happened – Pauline was given more stamps. Therefore we must draw 2 models.
- 2nd sentence tell us that even after Pauline was given more stamps, she still had fewer stamps than Grace. There Grace’s model will be longer than Pauline’s model. Since Grace had more stamps, we can cut Grace’s model into 2 parts.
- The 1st part of the model will have the same amount as Pauline (this is known as making parts equal).
- The 2nd part of the model will be the difference between both Grace and Pauline. We know Grace had 42 more stamps than Pauline (99-57=42), write “42” in the difference box.
- Label this as “Before” or “At First” model and label “G” for Grace’s model and “P” for Pauline’s model.
- Bring the model down and label this model as “End” or “After” model. We will make the changes in the “After” model. Use dotted lines to draw a box for Pauline as Pauline was given more stamps. Cut Grace’s difference box into 2 parts (that means Grace has 3 parts in total in her model). 1 part will have the same amount as what was given to Pauline, the 2nd part will be the new difference between them, which is 24.
- We can find the amount given to Pauline by taking the difference between them at first minus the difference between them in the end (42-24=18).
Pauline was given 18 stamps.
