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 · night shiftturno de noche
Protect the coral, one calculation at a time.Protege el coral, un cálculo a la vez.
A storm has scrambled the survey lines on the deep reef. Every fraction and decimal must go back to its exact spot, or the rescue boats will search in the wrong water.
Una tormenta revolvió las líneas de estudio del arrecife profundo. Cada fracción y cada decimal debe volver a su lugar exacto, o los botes de rescate buscarán en el agua equivocada.
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
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 the Plotting Error
- Name three different rational numbers between -1 and 0. Write each as both a fraction and a decimal. Explain how you know they are between -1 and 0.
- On a number line, point P is located at −2.5. Which statement describes its location best?
- At −3
- At −2
- Halfway between −2 and −3
- Halfway between 2 and 3
- Four depth sensors are shown on the survey line, where 0 is the water surface and each tick is 0.5. Which sensor reads −1 1/2?
- Sensor A
- Sensor B
- Sensor C
- Sensor D
- A sea turtle swims at −2 3/4 meters. A fish swims at the opposite reading. Write the fish's reading as a decimal.
- The survey crew records each reading as a fraction. Write it as a decimal, then write the integer just to its left on a number line. Fill in every empty cell.
- The number line from 0 to 1 is split into equal parts, as shown. Point P is the third mark to the right of 0. Which number is point P?
- 3/5
- 3/4
- 0.3
- 5/3
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.
- Which two integers does each reading fall between? Sort every reading into its home interval.
- Draw a number line from −6 to 6. Mark five rational numbers, at least two written as fractions or decimals. Label 0, include one pair of opposites, and explain how you decided where each number goes.
- 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.
- Pia wants to plot 3/4 on a line from 0 to 1 that is split into 4 equal parts. Find the step where her thinking goes wrong.
- Leo wants the decimal for −7/4 so he can place it. Find the step where his work goes wrong.
- Dara wants the opposite of −2 1/2. Find the step where her thinking goes wrong.
- Cam says, "0.5 and 1/2 are at different points, because one is a decimal and one is a fraction." Dee says, "−0.5 is the opposite of 1/2." Eli says, "0.50 is farther right than 0.5." Who is right?
- Cam only
- Dee only
- Eli only
- Cam and Eli
- What is the best next move?
- Split the space from −3 to −2 into 3 equal parts and mark 1 part to the right of −2.
- Split the space from −3 to −2 into 3 equal parts and mark 1 part to the right of −3.
- Split the space from −3 to −2 into 3 equal parts and mark 1 part to the left of −2.
- Change it to the decimal −2.13 and place it there.
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.
- Between which two integers is −3.4 located?
- −3 and −2
- 3 and 4
- −5 and −4
- −4 and −3
- A buoy reads 1/2 meter above the surface. A second buoy reads the opposite of the first buoy's reading. Write the second reading as a decimal.
- Four coral markers are shown on the survey line, where each tick is 0.25. Which marker is at −1 3/4?
- Marker A
- Marker C
- Marker B
- Marker D
- Which pair of numbers names the same point on a number line?
- −1/4 and −0.25
- −1/4 and −0.4
- 1/4 and −0.25
- −1/4 and −2.5
- Write 2 3/5 as a decimal.
- Create your own reef survey. Choose three readings: a negative fraction, a negative decimal and a positive mixed number. For each, say which two integers it is between and explain how you would place it on a number line.