3.MD.A.2 lessons
Measure and estimate masses of objects in grams and kilograms (and liquid volumes in litres), and solve one-step word problems with masses given in the same units.
The Common Core State Standards for Mathematics code 3.MD.A.2 asks students to: “Measure and estimate masses of objects in grams and kilograms (and liquid volumes in litres), and solve one-step word problems with masses given in the same units.” These Fieldbook lesson teaches it hands-on, with everyday materials, a printable teacher guide and a student sheet.
Measure It: Length, Time and Mass in the Real World Grade 3
- Which weighs more, a kilogram of feathers or a kilogram of rocks? 55–60 min
Teams build a coat-hanger balance to compare classroom objects, estimate masses in grams and check them on a kitchen scale, then heft three bags that look very different but may or may not have the same mass. Students explain why size doesn't tell you mass.
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