I can solve one-step addition and subtraction equations using inverse operations.Puedo resolver ecuaciones de suma y resta de un paso usando operaciones inversas.
MissionMisión · Home FieldCancha local
Train like a champion.Entrena como un campeón.
Welcome to Home Field. The coaches are tracking scores, laps and yards, and every stat has one missing number. Use inverse operations to find it, then check it.
Te damos la bienvenida a la cancha local. Los entrenadores siguen puntos, vueltas y yardas, y cada dato tiene un número que falta. Usa operaciones inversas para hallarlo y luego compruébalo.
Word bankBanco de palabras 4 words4 palabrasinverse operation, isolate, solution, …operación inversa, despejar, solución, …
- inverse operationoperación inversa
- An operation that undoes another one. Addition and subtraction are inverses.Una operación que deshace otra. La suma y la resta son inversas.
- isolatedespejar
- To get the variable by itself on one side of the equation.Dejar la variable sola en un lado de la ecuación.
- solutionsolución
- A number that makes the equation true when it replaces the variable.Un número que hace verdadera la ecuación cuando reemplaza a la variable.
- balanceequilibrio
- Keeping both sides equal by doing the same thing to each side.Mantener iguales los dos lados haciendo lo mismo en cada uno.
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: will n in n + 14 = 31 be greater or less than 31? Solve it with an inverse operation. Then test the wrong answer 45 by substituting. Write your prediction, your test, your evidence, and why you do the same step to both sides.
- Which equation represents: 'Three times a number equals 21'?
- n + 3 = 21
- n − 3 = 21
- 3n = 21
- n / 3 = 21
- Which equation represents: 'Seven less than a number is 18'?
- 7 − n = 18
- n − 7 = 18
- n + 7 = 18
- n / 7 = 18
- Which equation represents: 'A number plus 12 equals 30'?
- n − 12 = 30
- 12n = 30
- n + 12 = 30
- n / 12 = 30
- 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.
- Solve: x + 9 = 15
- x = 6
- x = 9
- x = 15
- x = 24
- Solve: y − 7 = 20
- y = 7
- y = 13
- y = 27
- y = 140
- Solve: n + 15 = 42
- n = 15
- n = 27
- n = 42
- n = 57
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 shirt costs $d. After a $15 discount, it costs $38. What is d?
- $23
- $38
- $45
- $53
- Sort each equation into the correct inverse operation you would use to solve it.
- Spot the Common Mistake
- What is the best next move?
- Add 14 to both sides.
- Subtract 14 from both sides.
- Subtract 14 from the left side only.
- Work out 14 − 31 to find x.
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 d + 4.5 = 12.
- d = 4.5
- d = 7.5
- d = 8.5
- d = 16.5
- Which operation undoes addition?
- Multiplication
- Division
- Subtraction
- Squaring
- Check: does 7.5 work?
- Yes — 7.5 + 4.5 = 12
- No — 7.5 + 4.5 = 11
- No — 7.5 − 4.5 = 3
- Only if the trail is 11 miles