Select and use appropriate tools to measure attributes of objects.
Convert among different-sized standard measurement units (i.e., km, m, cm; kg, g; lb, oz.; l, ml; hr, min, sec) within a given measurement system (e.g., convert 5 cm to 0.05 m), and use these conversions in solving multi-step, real world problems.
Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Use operations on fractions for this grade to solve problems involving information presented in line plots.
- Think about the conversion factor.
- Consider the relative sizes of the units. Which is bigger? Which is smaller?
- Use multiplication or division to determine your final answer, or use a table.
- Quarts are smaller than gallons, so that means I will ned more than 2 quarts to equal these 2 gallons.
- The conversion factor is 2 quarts = 1 gallon.
- I need 2 quarts to equal my first gallon, and 2 quarts to equal my second gallon. That's 4 quarts!
- Gallons are bigger than quarts, so that means I will need fewer than 4 gallons to equal these 4 quarts.
- The conversion factor is 1 gallon = 2 quarts.
- I need 1 gallon for every 2 quarts. I need 1 gallon to equal my first 2 quarts, and I need 1 more gallon to equal my second 2 quarts. That's 2 gallons in total!
Making a conversion table can help show the relationships between units, and the patterns that emerge. This can be a great strategy for students who are not ready to do conversions.