Multiply Decimals

6.NOS.3 · Unit 2 · Lesson 12

Name   Period

Objectives / Objetivos

Content Objective: I can multiply decimals and place the decimal point correctly in the product.

Language Objective: I can explain my work using the words product, decimal point, estimate, and decimal places.

Key Idea / Idea clave

Multiplying Decimals. 1. Multiply the numbers as if they were whole numbers (ignore decimals during multiplication). 2. Count the total number of decimal places in both factors. 3. Place the decimal point in the product so it has that same total number of decimal places

I Notice / Observo

  • What two quantities are being multiplied?
  • How many total decimal places do the two factors have?

I Wonder / Me pregunto

  • How can estimating help you check if your answer is reasonable?

Vocabulary / Vocabulario

Term / TérminoDefinition / Definición
Multiply Decimals
Multiplicar decimales		Find the product of decimals, then use place value to place the decimal point.
Hallar el producto de decimales y luego usar el valor posicional para colocar el punto decimal.
Product
Producto		The answer when you multiply.
La respuesta cuando multiplicas.
Decimal point
Punto decimal		The dot that splits the whole number from the part after it.
El punto que separa el número entero de la parte que sigue.
Estimate
Estimar		A close answer you get by rounding first.
Una respuesta cercana que obtienes al redondear primero.
Place value
Valor posicional		What a digit is worth based on where it sits in a number.
Lo que vale un dígito según el lugar que ocupa en el número.
Decimal places
Cifras decimales		How many digits come after the decimal point.
Cuántos dígitos hay después del punto decimal.

Practice Preview / Vista previa de práctica

  1. What is 3.4 × 2.6?
    1. 8.84
    2. 88.4
    3. 0.884
    4. 8.48
  2. Match each expression to its product.
  3. Complete each decimal multiplication.
  4. Find Kai's Mistake
    1. Step 1: Problem — 2.4 × 3.15
    2. Step 2: Multiply as whole numbers — 24 × 315 = 7,560
    3. Step 3: Count decimal places — 2.4 has 1 decimal place, 3.15 has 2 decimal places → 2 total
    4. Step 4: Place decimal — 75.60

    Which step has the mistake? Explain it and write the correct work.

Reflection / Reflexión

One thing I learned today / Una cosa que aprendí hoy: