I can write an equation for a real situation and check whether a given value is a solution by substituting it.Puedo escribir una ecuación para una situación real y comprobar si un valor dado es una solución sustituyéndolo.
MissionMisión · Sound StudioEstudio de sonido
Mix the track, then check the math.Mezcla la pista y revisa las matemáticas.
Welcome to the Sound Studio. Every track on the mixing board hides a mystery number. Test each value in its equation and keep only the ones that make both sides match.
Te damos la bienvenida al estudio de sonido. Cada pista de la mesa de mezclas esconde un número misterioso. Prueba cada valor en su ecuación y quédate solo con los que hacen que los dos lados coincidan.
Word bankBanco de palabras 4 words4 palabrasequation, variable, solution, …ecuación, variable, solución, …
- equationecuación
- A math sentence with an equal sign that says two sides have the same value.Una oración matemática con un signo igual que dice que dos lados tienen el mismo valor.
- variablevariable
- A letter that stands for a number that is unknown or can change.Una letra que representa un número desconocido o que puede cambiar.
- solutionsolución
- A value that makes an equation true when you put it in place of the variable.Un valor que hace verdadera una ecuación cuando lo pones en lugar de la variable.
- substitutesustituir
- To replace a variable with a number so you can check the equation.Reemplazar una variable con un número para poder comprobar la ecuación.
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 n = 15 is a solution of n + 12 = 30. Test it in the model, then test one more candidate. Write your prediction, the left side and the right side for each test, and your evidence. Explain how you know when a value is a solution.
- Find the value of 4n when n = 6.
- Which expression means 'a number increased by 7'?
- n − 7
- n + 7
- 7n
- n ÷ 7
- What does the equal sign in an equation tell you?
- The answer always comes next.
- The left side is the bigger side.
- Both sides use the same digits.
- Both sides have the same value.
- 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 equation represents: 'A number plus 12 equals 30'?
- n + 12 = 30
- n − 12 = 30
- 12n = 30
- n / 12 = 30
- Which equation represents: 'Seven less than a number is 18'?
- n − 7 = 18
- 7 − n = 18
- n + 7 = 18
- n / 7 = 18
- Which equation represents: 'Three times a number equals 21'?
- 3n = 21
- n + 3 = 21
- n − 3 = 21
- n / 3 = 21
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 detective found some fingerprints on Monday and 14 more on Tuesday, for a total of 30. Which equation represents this?
- f + 14 = 30
- f − 14 = 30
- 14f = 30
- f / 14 = 30
- Crack the Equation Error
- A witness statement reads: 'A number c of security cameras plus 6 more equals 19.' Which equation matches?
- c + 6 = 19
- 6c = 19
- c − 6 = 19
- c / 6 = 19
- What is the best next move?
- Replace p with 16, because 16 is on the right side.
- Say it is not a solution, because 9 is not equal to 16.
- Replace p with 9 and see if both sides have the same value.
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.
- Solve p + 14 = 37.
- p = 14
- p = 23
- p = 37
- p = 51
- Why subtract 14 from BOTH sides?
- To keep the equation balanced while isolating p
- Because subtraction is easier than addition
- Because 14 is the smaller number
- To make the answer a whole number
- Check your answer: does 23 work?
- Yes — 23 + 14 = 37
- No — 23 + 14 = 47
- No — 23 − 14 = 9
- You cannot check an equation