CCSS.Math.Content.4.MD.A
The standard
Solve problems involving measurement and conversion of measurements from a larger unit to a smaller unit.
Common Core State Standards for Mathematics
What this standard means
Students need to solve word problems with length, weight, mass, liquid volume, and time. They should convert larger units to smaller units, such as feet to inches or hours to minutes, then use the converted numbers in addition, subtraction, multiplication, or division problems.
Mastery looks like choosing the right unit, knowing the conversion fact, and showing the steps clearly. Students often get stuck by converting the wrong direction, forgetting to multiply, or mixing units in one calculation. They also may read past key details in multi-step problems.
Ways to teach it
- Give pairs rulers, meter sticks, and objects, then have them measure and convert each item from feet to inches or meters to centimeters.
- Ask students to write a word problem about cooking, sports, or travel that needs one measurement conversion to solve.
- Use four exit ticket problems, two simple conversions and two word problems, and have students circle the conversion fact they used.
- Bring in a grocery label, recipe, or track meet result, then ask students what unit conversions would help compare the amounts.
Plan a lesson for CCSS.Math.Content.4.MD.A
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Related standards
- CCSS.Math.Content.4.MD.A.2
Use the four operations to solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money, including problems involvin...
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Solve problems involving measurement and estimation of intervals of time, liquid volumes, and masses of objects.
- CCSS.Math.Content.6.RP.A.3d
Use ratio reasoning to convert measurement units; manipulate and transform units appropriately when multiplying or dividing quantities.
- CCSS.Math.Content.5.MD.A.1
Convert among different-sized standard measurement units within a given measurement system (e.g., convert 5 cm to 0.05 m), and use these conversions in solving ...