I can use equivalent ratio tables to determine the whole when I know a part and the percent it represents.Puedo usar tablas de razones equivalentes para determinar el total cuando conozco una parte y el porcentaje que representa.
Word bankBanco de palabras 6 words6 palabrasPart, Whole, Double number line, …Parte, Total, Recta numérica doble, …
- PartParte
- A piece of the whole.Una pieza del total.
- WholeTotal
- The full amount. It is always 100%.La cantidad completa. Siempre es 100%.
- Double number lineRecta numérica doble
- Two number lines side by side. Marks that line up go together.Dos rectas numéricas juntas. Las marcas que coinciden van juntas.
- EquationEcuación
- A math sentence with an equal sign.Una oración matemática con un signo de igual.
- PercentPorcentaje
- A number out of 100, shown with the % sign.Un número de cada 100, con el signo %.
- Inverse operationOperación inversa
- Two actions that undo each other, like × and ÷.Dos acciones que se deshacen entre sí, como × y ÷.
Tab 1: Ratio Table to a Friendly Percent
Scale the known percent down to a friendly percent (5%, 10%, 20%, 25% or 50%). Divide the amount the same way. Then scale up to 100% to find the whole.
Tab 2: Double Number Line
Same method on a double number line: jump from the known percent down to a friendly percent, then jump up to 100%. The amount line jumps by the same factors.
Tab 3: Tape Diagram
Same method with a tape: cut the 100% tape into equal chunks of a friendly percent (5%, 10%, 20%, 25% or 50%). Find the value of one chunk, then count up to all the chunks.
Tab 4: Ratio Tables in Stories
Find the known part and percent in the story. Scale down to a friendly percent, then scale up to 100% to find the whole.
Tab 5: Ratio Table Review (10 Questions)
Use equivalent ratios to find the 100% whole. Check that your scale factor changes the percent and amount in the same way.