Find and Compare with Percentages
Name Period
Objectives / Objetivos
Content Objective: I can find the percent of a number using an equation or a model.
Language Objective: I can explain my steps using the words percent, base, part, and equation.
Key Idea / Idea clave
Finding the Percent of a Number. Formula: Part = Percent × Whole. 1. Identify the percent and the whole (base amount). 2. Convert the percent to a decimal or simplified fraction. 3. Multiply the decimal/fraction by the whole to calculate the part
I Notice / Observo
- What information do you need to find the discount amount?
- How is finding 25% of 60 different from finding 40% of 80?
I Wonder / Me pregunto
- Is there more than one way to find a percent of a number?
Vocabulary / Vocabulario
| Term / Término | Definition / Definición |
|---|---|
| Percent of a Number Porcentaje de un número | A part of a number found by multiplying the number by the percent written as a decimal. Una parte de un número que se halla multiplicando el número por el porcentaje escrito como decimal. |
| Percent Porcentaje | A way to compare a number to 100, shown with the % sign. Una manera de comparar un número con 100, con el signo %. |
| Base Base | The whole amount you start with — the number right after the word “of.” La cantidad total con la que empiezas: el número que va después de la palabra “de”. |
| Part Parte | How much of the base (the whole) you get. It is your answer. Cuánto obtienes de la base (el total). Es tu respuesta. |
| Equation Ecuación | A number sentence with an equal sign. The percent one is: part = percent × base. Una oración numérica con signo de igual. La de porcentaje es: parte = porcentaje × base. |
| Discount Descuento | Money taken off the first price to make it cheaper. Dinero que se quita del precio original para que sea más barato. |
Practice Preview / Vista previa de práctica
Read each task. Show your work in the spaces provided and explain how you know.
1. What is 20% of 150?
- A 20
- B 30
- C 35
- D 75
Answer:
2. Complete each row to find the percent of a number.
Complete each empty cell. Show your reasoning below.
| Percent | Base | Part |
|---|---|---|
| 10% | 250 | |
| 75% | 120 | |
| 35% | 200 | |
| 8% | 50 |
3. An arcade prize costs 240 tickets. If you have a coupon for 15% off, how many tickets do you save?
- A 15 tickets
- B 24 tickets
- C 36 tickets
- D 204 tickets
Answer:
4. Find the Percent Error
Which step has the mistake, and what should it be?
Reflection / Reflexión
One thing I learned today / Una cosa que aprendí hoy: