1Question
A forest has 12 oak trees, 8 pine trees, and 5 maple trees. How many trees are in the forest altogether?
2Question
A pond has 18 frogs. Later, 7 frogs jump to a nearby wet area. How many frogs are still in the pond?
3Question
A scientist counts 14 beetles on one log and 9 beetles on another log. How many beetles are there in total?
4Question
A food web poster shows 6 grasshoppers, 4 rabbits, and 10 mice eating plants. How many herbivores are shown?
5Question
A wetland has 30 reeds. Wind bends 12 of them, but they still grow. How many reeds remain upright?
6Question
A bird eats 3 caterpillars each day. How many caterpillars does it eat in 5 days?
7Question
A pond receives 24 cm of rain in one month. If 6 cm evaporate, how much water remains from the rain in the pond system?
8Question
A rabbit population has 16 rabbits in spring and grows by 9 by summer. What is the new population?
9Question
A meadow has 40 flowers. Bees visit 15 of them in the morning and 13 in the afternoon. How many flowers were visited altogether?
10Question
A compost pile starts with 50 leaves. 20 leaves break down into soil-like material. How many leaves are left?
11Question
A pond food chain has 8 algae, and each algae patch can support 4 small snails. How many snails can the algae support?
12Question
A hawk eats 2 mice per day. How many mice does it eat in a week?
13Question
In a grassland, 36 grass plants feed 12 rabbits equally. How many grass plants are available per rabbit?
14Question
A dead log has 45 fungi spots. If 15 spots are on one side of the log, how many are on the other side?
15Question
A river ecosystem has 28 fish. If 7 fish are seen near the bank, what fraction of the fish are near the bank?
16Question
A forest has 3 layers of plants. Each layer has 14 small plants. How many small plants are there in all?
17Question
A classroom model of a food web uses 5 producers, 10 primary consumers, and 7 secondary consumers. How many organisms are in the model?
18Question
A park has 60 insects. 25 are ants and 15 are beetles. The rest are butterflies. How many butterflies are there?
19Question
A lake loses 8 liters of water each day to evaporation. How much water is lost in 4 days?
20Question
A coral reef has 9 sea stars. Each sea star can feed on 3 clams in a week. How many clams can all the sea stars feed on in a week?
21Question
A farmer plants 24 bean plants and 18 corn plants in a field. If 6 plants are eaten by insects, how many healthy plants are left?
22Question
A food chain shows that 50 units of energy are available to plants, and only 10 units reach the herbivores. How many units of energy are lost between these two levels?
23Question
A meadow starts with 40 rabbits. The population increases by 25% in one season. How many new rabbits are added?
24Question
A pond has 96 tadpoles. If they are grouped equally into 8 areas of the pond, how many tadpoles are in each area?
25Question
A forest fire affects 30% of 100 young trees. How many young trees are affected?
26Question
A beaver pond has 72 sticks. Beavers use 1/3 of them to build a dam. How many sticks are used?
27Question
A teacher sets up 6 mini-ecosystems. Each one contains 4 plants, 3 insects, and 2 snails. How many living things are in all 6 mini-ecosystems?
28Question
A bird population is 80 at the start of the year. If 12 birds migrate away and 18 birds are born, what is the new population?
29Question
A food web study finds that 45 out of 60 insects are pollinators. What fraction of the insects are pollinators?
30Question
A pond’s oxygen level is 10 mg/L in the morning and drops by 2 mg/L each hour for 3 hours. What is the oxygen level after 3 hours?
31Question
A grassland contains 3 times as many mice as hawks. If there are 14 hawks, how many mice are there?
32Question
A scientist counts 64 leaves on 8 plants. If each plant has the same number of leaves, how many leaves does each plant have?
33Question
A wetland absorbs 15 liters of runoff on Monday, 18 liters on Tuesday, and 12 liters on Wednesday. How much runoff is absorbed in all?
34Question
A predator-prey graph shows 48 rabbits in one month and 36 rabbits the next month. How many rabbits decreased from one month to the next?
35Question
A lake food web has 150 kg of algae. If only 10% of that energy passes to small fish, how many kilograms are represented at the small fish level?
36Question
A forest has 5 identical sections. Each section has 18 trees, and each tree supports 4 bird nests. How many bird nests are supported in the forest?
37Question
A recycling program keeps 84 kg of paper out of landfills each month. How much paper is kept out of landfills in 6 months?
38Question
In a coral reef, 120 plankton are eaten by small fish. If 1/4 of the small fish are then eaten by larger fish, and there are 60 small fish, how many small fish are eaten by larger fish?
39Question
A rainforest plot has 200 insects. 35% are beetles, 25% are ants, and the rest are butterflies. How many butterflies are in the plot?
40Question
A desert ecosystem study shows that each cactus can store 9 liters of water. If a group of 12 cacti stores water equally, and 27 liters are used by animals, how much water remains?