Measure Everyday Amounts

Overview

In Lesson 15 of 18 in Math in Our World, students compare and measure the weight and liquid amounts of familiar objects. They build on prior work with measurement by selecting sensible tools and standard units, then apply their understanding to everyday situations.

Learning intentions

• Students will be able to compare objects as heavier or lighter.
• Students will be able to measure or estimate mass using grams and kilograms.
• Students will be able to compare liquid amounts and identify appropriate capacity tools and units.
• Students will be able to explain why a tool or unit makes sense for a situation.

Success criteria

• I can compare two objects or amounts using heavier, lighter, more, or less.
• I can choose a sensible tool and unit for measuring.
• I can use grams, kilograms, liters, milliliters, cups, or a measuring cup appropriately.
• I can explain my answer using a picture, measurement, or words.

Curriculum links

• Measurement and Data — measure and estimate liquid volumes and masses using grams, kilograms, and liters.
• Measurement and Data — solve one-step problems involving mass or liquid volume in the same units.
• Mathematical practices — reason quantitatively, use appropriate tools strategically, and explain thinking.

Lesson structure (30 minutes)

1. 0–3 min · Hook and connect. Teacher opens the introduction slides with a striking image of a backpack, water bottle, and measuring cup and asks, “How could we find out which is heavier or which holds more?” Students make a quick prediction, then share a reason with a partner.

2. 3–15 min · Mini-lesson: I do and We do. Teacher demonstrates a balance scale, a measuring cup, and picture labels for heavy, light, gram, kilogram, cup, liter, and milliliter; model that a balance compares mass, while a measuring cup or container measures liquid amount. Students use hand motions and repeat the vocabulary, then help place teacher-prepared object cards on the heavy or light side of a class sorting mat. Teacher fills a virtual container on the introduction slides to a marked amount and asks, “Would this be measured in milliliters or liters? Why?”

3. 15–20 min · Guided practice: We do. Teacher gives each student two or three picture cards and presents situations such as “a pencil or a desk” and “a spoonful or a pitcher of water.” Students move cards to the heavier/lighter or more/less side, select a likely unit, and explain their choice using the sentence frame, “I chose ___ because ___.” Teacher checks each student’s reasoning and corrects misconceptions immediately.

4. 20–25 min · Independent practice: You do. Teacher distributes the measure weight and liquid amounts worksheet. Students sort or measure available classroom items, such as a pencil, book, empty bottle, and cup, and complete five three-choice questions about heavier/lighter, capacity, tools, and units. Students may use a balance scale, measuring cup, or picture labels as needed.

5. 25–29 min · Assessment conference. Teacher reviews answers with students one at a time or as a small group, asking selected students to justify one answer with an object, drawing, or demonstration. Students correct an answer if needed and explain whether their choice of tool or unit was sensible.

6. 29–30 min · Closure. Teacher returns to the learning intention on the introduction slides and asks students to complete the oral prompt, “I can compare amounts and choose a tool and unit when I ___.” Students share one example before leaving the table.

Resources

• the introduction slides
• the measure weight and liquid amounts worksheet
• Balance scale
• Measuring cup and clear containers
• Classroom objects such as pencils, books, cups, and bottles
• Teacher-made picture cards and heavy/light and more/less sorting mats
• Water or other safe liquid
• Gram, kilogram, liter, milliliter, and cup picture labels
• Pencils and large-print vocabulary cards

Assessment

• During modeling and guided practice, listen for accurate comparisons and ask, “What makes you think that?” Note whether each student distinguishes mass from liquid amount.
• Check that students select a sensible tool and unit, such as grams for a light object, kilograms for a heavy object, milliliters for a small amount, and liters for a larger amount.
• Use the worksheet’s five three-choice questions as the exit assessment. Record students who need additional practice with comparison language, tools, or units.

Differentiation

• For support, begin with nonstandard comparisons such as holding two objects or balancing them before introducing grams and kilograms. Use real objects, picture labels, gestures, and tactile measuring experiences.
• Provide dyslexia-friendly materials: clear large-print sans-serif text, strong spacing, object photos rather than dense text, symbol-supported vocabulary, short answer choices, and teacher-read directions and questions.
• Offer sentence starters such as “The ___ is heavier than the ___,” “I would use a ___,” and “I chose ___ because ___.” Allow students to answer orally, point, sort, draw, or demonstrate.
• For students ready for more challenge, ask them to estimate before measuring, explain why an estimate was reasonable, or create a new everyday comparison using an appropriate tool and unit.