Reef Reckoning Worksheet Reef Reckoning
Marine Math Lab
Explorer Name:
Date:
Dive deep into the coral reef! Use your multiplication skills to solve these underwater mysteries. Show your work in the designated observation zones.
1
A vibrant reef colony has 8 separate anemones. Each anemone is home to 145 tiny clownfish. How many clownfish are living in this reef colony in total?
Observation Zone (Show Your Work)
Final Answer:
clownfish
2
Marine biologists are studying a cluster of 4 massive brain corals. They estimate that each coral has 362 deep ridges on its surface. What is the total number of ridges in the cluster?
Observation Zone (Show Your Work)
Final Answer:
ridges
3
A green sea turtle swims 215 miles every week during its long migration across the ocean. If the turtle continues at this pace for 7 weeks, how many total miles will it travel?
Observation Zone (Show Your Work)
Final Answer:
miles
4
An underwater exploration team is preparing for a mission. They have 6 heavy crates of oxygen tanks. Each crate holds 124 tanks. How many oxygen tanks does the team have in total?
Observation Zone (Show Your Work)
Final Answer:
oxygen tanks
5
In a single liter of tropical seawater, a scientist counts 528 tiny plankton. If the scientist collects 9 liters of seawater to study, how many total plankton will be in the samples?
Observation Zone (Show Your Work)
Final Answer:
plankton
6
To help restore a damaged reef, divers plant 3 long rows of staghorn coral. Each row contains 285 coral fragments. How many total coral fragments were planted in the restoration area?
Observation Zone (Show Your Work)
Final Answer:
fragments
Reef Reckoning Answer Key Reef Reckoning
Marine Math Lab
Answer Key
1
A vibrant reef colony has 8 separate anemones. Each anemone is home to 145 tiny clownfish.
\( 145 \times 8 = 1,160 \)
Correct Answer
1,160 clownfish
2
Marine biologists are studying a cluster of 4 massive brain corals. They estimate that each coral has 362 deep ridges.
\( 362 \times 4 = 1,448 \)
Correct Answer
1,448 ridges
3
A green sea turtle swims 215 miles every week. If the turtle continues for 7 weeks, how many miles will it travel?
\( 215 \times 7 = 1,505 \)
Correct Answer
1,505 miles
4
An underwater exploration team has 6 heavy crates of oxygen tanks. Each crate holds 124 tanks.
\( 124 \times 6 = 744 \)
Correct Answer
744 oxygen tanks
5
In a single liter of tropical seawater, a scientist counts 528 tiny plankton. The scientist collects 9 liters.
\( 528 \times 9 = 4,752 \)
Correct Answer
4,752 plankton
6
Divers plant 3 long rows of staghorn coral. Each row contains 285 coral fragments.
\( 285 \times 3 = 855 \)
Correct Answer
855 fragments
Reef Reckoning Slides Reef
Reckoning
Marine Math Expedition
Mission: 3-Digit x 1-Digit Multiplication
Your Mission
Today, we are marine biologists. We need to calculate large populations of reef life using multiplication.
Multiply 3-digit numbers by 1-digit numbers.
Solve real-world underwater mysteries.
Choose Your Gear
Area Model
Break it down by place value!
100
40
5
x 6
Standard Algorithm
Stack and multiply vertically.
1 4 5
x 6
Observation Report
A research boat counts 128 sea turtles in each of the 5 major reef zones.
How many turtles are in all 5 zones?
\( 128 \times 5 = ? \)
Step-by-Step Solution
1
Multiply Ones
\( 8 \times 5 = 40 \)
Keep 0, carry 4 tens.
2
Multiply Tens
\( 2 \times 5 = 10 \)
\( 10 + 4 = 14 \)
Keep 4, carry 1 hundred.
3
Multiply Hundreds
\( 1 \times 5 = 5 \)
\( 5 + 1 = 6 \)
Total: 640 Sea Turtles!
Mission Start
Head back to your lab station and grab your mission sheet.
Show all your work in the observation zones.
Double check your calculations.
Be a reef hero!
Reef Rescue Worksheet Reef Rescue
Mixed Operations Task
Explorer Name:
Date:
1
A marine conservation team is tracking sea turtle eggs. In June, they found 1,458 eggs. In July, they found another 2,392 eggs. How many eggs did they find in total over the two months?
Calculation Zone
Final Answer:
eggs
2
A large school of parrotfish contained 5,000 fish. After a group of predators arrived, 1,245 fish swam away to deeper water. How many parrotfish are left in the original school?
Calculation Zone
Final Answer:
fish
3
Divers are cleaning up a reef. They collected 875 pounds of plastic waste in the morning and 1,120 pounds in the afternoon. What is the total weight of the waste collected?
Calculation Zone
Final Answer:
pounds
4
A scientist observed a coral colony with 3,210 healthy polyps. Due to rising temperatures, 945 polyps became bleached. How many healthy polyps remain in the colony?
Calculation Zone
Final Answer:
polyps
Pro Tip: Always align your place values (thousands, hundreds, tens, and ones) before you start adding or subtracting!
Reef Rescue Answer Key Reef Rescue
Marine Math Lab
Answer Key
1
A conservation team found 1,458 eggs in June and 2,392 eggs in July. Total eggs?
\( 1,458 + 2,392 = 3,850 \)
Correct Answer
3,850 eggs
2
A school of 5,000 parrotfish. 1,245 fish swam away. How many are left?
\( 5,000 - 1,245 = 3,755 \)
Correct Answer
3,755 fish
3
Divers collected 875 pounds of waste in the morning and 1,120 pounds in the afternoon. Total weight?
\( 875 + 1,120 = 1,995 \)
Correct Answer
1,995 pounds
4
A colony with 3,210 healthy polyps. 945 polyps became bleached. How many healthy polyps remain?
\( 3,210 - 945 = 2,265 \)
Correct Answer
2,265 polyps
Reef Rangers Division Worksheet Reef Rangers
Division Patrol
Ranger Name:
Date:
Welcome to the Division Patrol! Your mission is to split large groups of reef data into equal parts. Don't forget to account for any remainders!
1
A team of scientists found 840 clownfish eggs attached to a large coral. They want to distribute them equally into 6 protected nursery tanks. How many eggs will go into each tank?
Division Zone (Show Your Work)
Final Answer:
eggs per tank
2
A group of 544 divers is visiting the Great Barrier Reef. The tour company puts an equal number of divers onto 4 different boats. How many divers are on each boat?
Division Zone (Show Your Work)
Final Answer:
divers
3
Marine biologists collected 1,260 coral fragments to plant in a damaged area. They want to plant them in 9 equal rows. How many fragments will be in each row?
Division Zone (Show Your Work)
Final Answer:
fragments
4
A beach cleanup crew found 478 sea shells tangled in a net. They want to put them into bags of 5 shells each. How many full bags can they make, and how many shells will be left over?
Division Zone (Show Your Work)
Full Bags:
Remaining Shells:
Ranger Certification
Once you have completed all 4 division missions, present this to your lead scientist for verification.
Reef Rangers Division Answer Key Reef Rangers
Marine Math Lab
Division Answer Key
1
840 clownfish eggs distributed into 6 protected nursery tanks.
\( 840 \div 6 = 140 \)
Correct Answer
140 eggs per tank
2
544 divers visiting the reef, split onto 4 different boats.
\( 544 \div 4 = 136 \)
Correct Answer
136 divers per boat
3
1,260 coral fragments to be planted in 9 equal rows.
\( 1,260 \div 9 = 140 \)
Correct Answer
140 fragments per row
4
478 sea shells put into bags of 5 shells each.
\( 478 \div 5 = 95 \text{ R } 3 \)
Correct Answer
95 bags, 3 shells remaining
Spring Sprint Worksheet Spring Sprint
Seasonal Math Challenge
Gardener Name:
Date:
1
A community garden is planting 8 long rows of tulips. Each row has 125 tulip bulbs. How many tulips will be in the garden when they all bloom?
Show Your Work
Final Answer:
tulips
2
During a spring bird count, students spotted 1,245 robins in the morning and 987 robins in the afternoon. What is the total number of robins they saw that day?
Show Your Work
Final Answer:
robins
3
A local park has a total of 3,000 packets of wildflower seeds to give away. By the end of the spring festival, they have 842 packets left. How many seed packets were given away?
Show Your Work
Final Answer:
packets
4
A farmer harvested 456 fresh strawberries. He wants to put an equal number of strawberries into 8 smaller baskets. How many strawberries will go in each basket?
Show Your Work
Final Answer:
strawberries
5
A landscaping company is planting 3 large garden beds. Each bed needs 215 petunias. If they also buy 150 marigolds for the borders, how many total plants did they buy?
Show Your Work
Final Answer:
plants
Spring Sprint Answer Key Spring Sprint
Marine Math Lab
Answer Key
1
8 rows of tulips with 125 bulbs in each row. Total tulips?
\( 125 \times 8 = 1,000 \)
Correct Answer
1,000 tulips
2
1,245 robins in the morning and 987 robins in the afternoon. Total?
\( 1,245 + 987 = 2,232 \)
Correct Answer
2,232 robins
3
3,000 packets total, 842 packets left. How many given away?
\( 3,000 - 842 = 2,158 \)
Correct Answer
2,158 packets
4
456 strawberries put into 8 equal baskets. Strawberries per basket?
\( 456 \div 8 = 57 \)
Correct Answer
57 strawberries
5
3 beds of 215 petunias each, plus 150 marigolds. Total plants?
\( (215 \times 3) + 150 = 645 + 150 = 795 \)
Correct Answer
795 plants
