I can place rational numbers, including fractions and decimals, on a number line.Puedo ubicar números racionales, incluidas fracciones y decimales, en una recta numérica.
MissionMisión · Reef RescueRescate del arrecife
Protect the coral, one calculation at a time.Protege el coral, un cálculo a la vez.
Welcome to Reef Rescue! Divers log corals, fish and sensors at exact depths, and many readings fall between whole numbers. Place each one at its exact spot on the survey line before the tide turns.
¡Bienvenidos a Rescate del arrecife! Los buzos anotan corales, peces y sensores en profundidades exactas, y muchas lecturas caen entre números enteros. Coloca cada una en su lugar exacto de la línea de estudio antes de que cambie la marea.
Word bankBanco de palabras 5 words5 palabrasrational number, fraction, decimal, …número racional, fracción, decimal, …
- rational numbernúmero racional
- A number that can be written as a fraction of two integers, with a bottom number that is not zero.Un número que se puede escribir como una fracción de dos enteros, con un denominador distinto de cero.
- fractionfracción
- A number that shows part of a whole, like 3/4.Un número que muestra una parte de un todo, como 3/4.
- decimaldecimal
- A number with a point, like 0.5, that shows a part less than one.Un número con un punto, como 0.5, que muestra una parte menor que uno.
- equivalentequivalente
- Having the same value but written a different way, like 1/2 and 0.5.Que tiene el mismo valor pero escrito de otra forma, como 1/2 y 0.5.
- oppositeopuesto
- A number the same distance from 0 as another number, on the other side of 0.Un número a la misma distancia del 0 que otro número, del otro lado del 0.
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.
- Predict whether 4 1/2 and its opposite are the same distance from zero. Test both numbers in the model. Write each as a decimal, name the two integers each one lies between, and say what the model showed.
- What is the opposite of −6?
- 0
- 6
- −6
- −12
- On a number line, which number is farther to the LEFT: −8 or −3?
- −3
- They are the same
- −8
- Neither is on the line
- Which integer is the LEAST: −3, 5, −8, 2, 0?
- 0
- −3
- 5
- −8
- 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.
- Which point is located between −1 and −2 on the number line?
- −2.5
- −1.5
- −0.5
- 1.5
- Which fraction is equivalent to 0.25?
- 1/4
- 1/2
- 1/3
- 2/5
- Match each fraction to its decimal equivalent.
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.
- Fill in the table
- Which rational number is closest to 0 on the number line?
- −2
- −1/4
- 0.5
- 1.75
- Which number is farthest to the LEFT on a number line?
- −4
- −1
- 0
- 2
- What is the best next move?
- Split the space from 0 to 1 into 4 equal parts and count 3 of them.
- Split the space from 0 to 1 into 3 equal parts and count 4 of them.
- Put a point at 3 and label it 3/4.
- Put the point halfway between 0 and 1, since 3/4 is close to a half.
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.
- Where does −1.25 fall on the number line?
- Between −1 and −2
- Between −1 and 0
- Between 1 and 2
- Exactly at −1
- Which day had the water level closest to the painted mark?
- Wednesday at −0.5 ft
- Monday at +0.75 ft
- Tuesday at −1.25 ft
- Thursday at +1.5 ft
- Why are rational numbers more useful here than integers alone?
- They let the scientist record part-of-a-foot changes like 0.75 and −1.25
- They are easier to add
- Integers cannot be negative
- They make the lake bigger