Kids Academy worksheet with word problems on addition and subtraction involving zoo animals and muffins.

Let's solve the two word problems step by step.

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Problem 1:

At the zoo, Alex took 12 pictures at the monkey house and 28 pictures at the polar display. He used 18 of these pictures in his photo album. How many pictures did he not use?

#### Step-by-Step Solution:
1. Find the total number of pictures Alex took:
- Pictures taken at the monkey house: 12
- Pictures taken at the polar display: 28
- Total pictures = 12 + 28 = 40

2. Determine how many pictures Alex used:
- Pictures used in the photo album: 18

3. Calculate the number of pictures Alex did not use:
- Total pictures = 40
- Pictures used = 18
- Pictures not used = Total pictures - Pictures used
- Pictures not used = 40 - 18 = 22

#### Final Answer:
The number of pictures Alex did not use is 22.

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Problem 2:

There were 340 blueberry muffins and 250 strawberry muffins in the zoo cafeteria. Children ate 500 muffins. How many muffins did the zoo cafeteria have left?

#### Step-by-Step Solution:
1. Find the total number of muffins initially in the cafeteria:
- Blueberry muffins: 340
- Strawberry muffins: 250
- Total muffins = 340 + 250 = 590

2. Determine how many muffins the children ate:
- Muffins eaten by children: 500

3. Calculate the number of muffins left in the cafeteria:
- Total muffins = 590
- Muffins eaten = 500
- Muffins left = Total muffins - Muffins eaten
- Muffins left = 590 - 500 = 90

#### Final Answer:
The number of muffins left in the zoo cafeteria is 90.

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Final Answers:

1. Number of pictures Alex did not use: 22
2. Number of muffins left in the zoo cafeteria: 90

Boxed Answers:
1. \(\boxed{22}\)
2. \(\boxed{90}\)