I can write and describe a ratio that compares two quantities.Puedo escribir y describir una razón que compara dos cantidades.
MissionMisión · Reef RescueRescate del arrecife · night shiftturno de noche
Protect the coral, one calculation at a time.Protege el coral, un cálculo a la vez.
At night the reef glows and the rescue crews work by lamplight. Every tank must keep its exact fish ratio until morning, so read each comparison carefully.
De noche el arrecife brilla y las cuadrillas de rescate trabajan a la luz de lámparas. Cada tanque debe mantener su razón exacta de peces hasta la mañana, así que lee cada comparación con cuidado.
Word bankBanco de palabras 5 words5 palabrasratio, part-to-part, part-to-whole, …razón, parte a parte, parte a todo, …
- ratiorazón
- A way to compare two amounts, like 3 to 2.Una manera de comparar dos cantidades, como 3 a 2.
- part-to-partparte a parte
- A ratio that compares one part of a group to another part.Una razón que compara una parte de un grupo con otra parte.
- part-to-wholeparte a todo
- A ratio that compares one part to the whole group.Una razón que compara una parte con todo el grupo.
- colon notationnotación con dos puntos
- Writing a ratio with two dots between the numbers, like 3:2.Escribir una razón con dos puntos entre los números, como 3:2.
- simplest formforma más simple
- A ratio whose terms are divided by the largest number that divides both.Una razón cuyos términos se dividieron entre el mayor número que divide a ambos.
Stage 1 of 5Etapa 1 de 5
Start StrongEmpieza fuerte
Each rung is harder than the last, and the numbers change every time.
Cada peldaño es más difícil que el anterior y los números cambian cada vez.
- 6 fresh problems with new numbers each time (interactive only).
Stage 2 of 5Etapa 2 de 5
Stretch Your ThinkingAmplía tu pensamiento
Plan, solve, then check that your answer makes sense.
Planea, resuelve y revisa que tu respuesta tenga sentido.
- Find Aliya's Mistake
- A bag of marbles has 8 red, 6 blue, and 4 green marbles. Write three different ratios using these quantities: one part-to-part ratio, one part-to-whole ratio, and explain the difference.
- The bar graph shows the fish in a rescue tank. What is the ratio of gobies to all the fish in the tank, in simplest form?
- 3:15
- 6:1
- 1:6
- 3:9
- A coral nursery plants staghorn and brain coral in the ratio 5:3. A tray holds 40 fragments in all. How many fragments are staghorn?
- Reef shrimp are fed with clownfish in the ratio 2:3 in every tank. Fill in the missing numbers so every row keeps the ratio 2 clownfish to 3 shrimp.
- A reef survey counted 12 sea turtles and 8 rays. Which statement is correct?
- The ratio of the rays to all the animals is 8:20.
- The ratio of the turtles to the rays is 8:12.
- The ratio of the turtles to all the animals is 12:8.
- The ratio of the turtles to the rays is 12:20.
Stage 3 of 5Etapa 3 de 5
InvestigateInvestiga
Use the model to test an idea. Then check it.
Usa el modelo para probar una idea. Luego compruébala.
- Match each reef sentence with the ratio that describes it, in simplest form.
- Design a drink card with two ingredients. Write a part-to-part ratio and a part-to-whole ratio in colon notation. Explain how a customer can check both with a tape diagram.
- 4 fresh problems with new numbers each time (interactive only).
Stage 4 of 5Etapa 4 de 5
Find and FixEncuentra y corrige
Somebody made a mistake. Find the step and fix it.
Alguien cometió un error. Encuentra el paso y corrígelo.
- A diver wrote a ratio for the tank. One step goes wrong. Tap the first step that is wrong.
- A volunteer wrote a part-to-whole ratio. One step goes wrong. Tap the first step that is wrong.
- A student wrote 12:18 in simplest form. One step goes wrong. Tap the first step that is wrong.
- A tank has 6 turtles and 4 rays. Mia says the ratio of turtles to rays is 6:4, which is the same as 3:2. Omar says it is 2, because there are 2 more turtles. Who is right?
- Only Omar: the ratio is how many more turtles there are.
- Only Mia: a ratio compares amounts, and 6:4 is 3:2.
- Both are right, because 2 is the difference in 3:2.
- Neither: the right ratio is 4:6 for these groups.
- What is the best next move?
- Stop here, since 9 : 6 is in simplest form.
- Divide only the 9 by 3, to get 3 : 6.
- Divide both 9 and 6 by 3 to get 3 : 2.
- Subtract 9 − 6 and say the ratio is 3.
- 1 fresh problem with new numbers each time (interactive only).
Stage 5 of 5Etapa 5 de 5
Prove Your UnderstandingDemuestra tu comprensión
Say how sure you are, solve, then create a problem of your own.
Di qué tan seguro estás, resuelve y luego crea un problema tuyo.
- A reef tank has 14 clownfish and 21 tangs. Which ratio is equivalent to the ratio of clownfish to tangs?
- 2:3
- 3:2
- 7:14
- 14:35
- Of the 36 fish in a reef tank, the ratio of parrotfish to all fish is 1:4. How many parrotfish are in the tank?
- A tank holds 5 red fish and 3 blue fish. Which ratio compares the blue fish to ALL the fish?
- 3:5
- 8:3
- 3:8
- 5:8
- Divers and boat crew work in the ratio 3:2. There are 12 divers. How many people are on the boat crew?
- A tank has 12 fish, and 4 of them are damselfish. Which statement is true?
- The ratio of damselfish to other fish is 4:12.
- The ratio of damselfish to all fish is 1:2.
- The ratio of other fish to damselfish is 1:2.
- For every 1 damselfish there are 2 other fish.
- Write your own Reef Rescue story with two groups. Give one part-to-part ratio and one part-to-whole ratio, write each in colon notation, and explain how they are different.