How Much Longer?
Aligned to 2.MD.A.4 — Common Core State Standards for Mathematics.
What this lesson teaches
To find how much longer one object is than another, measure both and subtract the smaller length from the bigger one.
Worked examples
Example 1
A red ribbon is 12 cm and a blue ribbon is 8 cm. How much longer is red? 12 - 8 = 4 cm longer.
Example 2
A pencil is 17 cm and a marker is 11 cm. 17 − 11 = 6, so the pencil is 6 cm longer.
Example 3
Compare only matching units. A 10-inch rope and a 10-centimeter rope are not the same length, so convert first.
Practice questions
- A stick is 9 inches and a pencil is 6 inches. How much longer is the stick?
- A rope is 15 cm and a string is 7 cm. How much longer is the rope?
- One crayon is 8 cm, another is 5 cm. Find the difference.
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
¿Cuánto más largo?
Para saber cuánto más largo es un objeto que otro, mide ambos y resta el largo más pequeño del más grande.
Ejemplo 1: Un listón rojo mide 12 cm y uno azul mide 8 cm. ¿Cuánto más largo es el rojo? 12 - 8 = 4 cm más largo.
Ejemplo 2: Un lápiz mide 17 cm y un marcador mide 11 cm. 17 − 11 = 6, así que el lápiz es 6 cm más largo.
Ejemplo 3: Compara solo unidades iguales. Una cuerda de 10 pulgadas y una de 10 centímetros no miden lo mismo, así que primero convierte.
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