Operations and Algebraic Thinking

There are 8 birds in a tree. 7 more birds fly in. How many birds are in the tree now?

Sofia has 10 crayons. She has 2 more crayons than Eli. How many crayons does Eli have?

There are 9 cars on the road. Some more cars drive by. Now there are 16 cars on the road. How many cars drove by?

Tom has 3 blue cars, 7 red cars, and 5 yellow cars. How many toy cars does Tom have in all?

Some children are on the playground. 9 more children come to play. Now there are 17 children on the playground. How many children were there at the start?

There are 18 balloons in a bag. Some balloons pop. Now there are 11 balloons in the bag. How many balloons popped?

There are 15 cookies on a plate. 8 cookies are eaten. How many cookies are left?

Ben has 7 toy cars. He has 5 fewer cars than Maya. How many toy cars does Maya have?

Lena has 14 stickers. Max has 9 stickers. How many more stickers does Lena have than Max?

Some frogs are sitting on a log. 9 frogs jump into the water. Now there are 10 frogs left on the log. How many frogs were on the log at the start?