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
Protect the coral, one calculation at a time.Protege el coral, un cálculo a la vez.
Reef Rescue needs a ratio expert. Divers count fish, plant coral, and mix reef food, and every count compares two amounts. Use ratios to keep the reef in balance.
Reef Rescue necesita un experto en razones. Los buzos cuentan peces, plantan coral y mezclan alimento, y cada conteo compara dos cantidades. Usa razones para mantener el equilibrio del arrecife.
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
Get ReadyPrepárate
Wake up what you know, then explore today's model.
Activa lo que sabes y luego explora el modelo de hoy.
- Start with 6 cups of juice and 3 cups of water. Write the part-to-part ratio of juice to water and the part-to-whole ratio of juice to the whole drink. Explain why their second numbers are different.
- A rescue tank has 5 blue tangs and 3 yellow tangs. How many tangs are in the tank in all?
- Each volunteer plants 3 coral fragments. How many fragments do 6 volunteers plant?
- 9
- 18
- 2
- 3
- A reef sign shows 6 clownfish and 9 gobies. Both numbers can be divided by the same number. Which pair do you get by dividing both by 3?
- 2 and 3
- 3 and 6
- 2 and 9
- 18 and 27
- 1 fresh problem with new numbers each time (interactive only).
Stage 2 of 5Etapa 2 de 5
Try ItInténtalo
Use the hints when you need them. Every wrong answer tells you why.
Usa las pistas cuando las necesites. Cada respuesta incorrecta te dice por qué.
- A recipe uses 4 cups of milk and 1 cup of cream. What is the ratio of milk to cream?
- 1:4
- 4:1
- 4:5
- 5:1
- Chef Reyes uses 6 strawberries and 2 bananas in a smoothie. What is the part-to-whole ratio of bananas to total fruit?
- 2:8
- 2:6
- 6:2
- 8:2
- In a class of 30 students, 18 are girls. What is the part-to-part ratio of boys to girls?
- 12:18
- 12:30
- 18:12
- 18:30
Stage 3 of 5Etapa 3 de 5
On Your OwnPor tu cuenta
Tables, mistakes to find, and problems with a few steps.
Tablas, errores por encontrar y problemas de varios pasos.
- A fruit salad has 5 pieces of melon, 3 pieces of pineapple, and 2 grapes. What is the ratio of pineapple to melon?
- 3:5
- 3:10
- 3:2
- 5:3
- Fill in the table
- A parking lot has 10 cars and 6 trucks. What is the part-to-whole ratio of trucks to total vehicles?
- 6:16
- 6:10
- 10:6
- 16:6
- What is the best next move?
- Add 4 + 7 to find the total, then compare 4 to it.
- Write 4 : 7, comparing the red marbles to the green.
- Write 7 : 4, comparing the green marbles to the red.
- Subtract 7 − 4 to see how many more green there are.
Stage 4 of 5Etapa 4 de 5 · OptionalOpcional
Practice MorePractica más
Optional extra practice. Press New numbers for another problem on the same skill.
Práctica extra opcional. Toca Números nuevos para otro problema de la misma habilidad.
- 5 fresh problems with new numbers each time (interactive only).
Stage 5 of 5Etapa 5 de 5
Show What You KnowDemuestra lo que sabes
Show what you learned today. Take your time; you can try again.
Muestra lo que aprendiste hoy. Tómate tu tiempo; puedes intentarlo otra vez.
- Keeping the 3:2 ratio, how many main dishes go with 10 side dishes?
- 5
- 12
- 15
- 20
- What kind of ratio is 3 mains to 2 sides?
- Part-to-whole, because it compares mains to all dishes
- A rate, because it uses different units
- Part-to-part, because it compares two separate groups
- Not a ratio at all
- With 15 mains and 10 sides, what is the ratio of mains to TOTAL dishes?
- 2 to 5
- 3 to 5
- 3 to 2
- 15 to 10