Operating with Decimals
Aligned to 6.NS.B.3 — Common Core State Standards for Mathematics.
What this lesson teaches
To add or subtract decimals, line up the decimal points. To multiply, ignore the points, multiply, then count decimal places. To divide, shift the point in both numbers so you are dividing by a whole number.
Worked example
7.2 ÷ 0.9: move each point one place → 72 ÷ 9 = 8. Check by multiplying: 8 × 0.9 = 7.2. ✓
Practice questions
- Add 14.65 + 8.9.
- Multiply 3.4 × 2.5.
- A ribbon is 12.6 meters long and is cut into pieces 0.7 meters each. How many pieces?
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Operaciones con Decimales
Para sumar o restar decimales, alinea los puntos decimales. Para multiplicar, ignora los puntos, multiplica y luego cuenta los lugares decimales. Para dividir, mueve el punto en ambos números para dividir entre un número entero.
Ejemplo: 7.2 ÷ 0.9: mueve cada punto un lugar → 72 ÷ 9 = 8. Comprueba multiplicando: 8 × 0.9 = 7.2. ✓
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