Long, Short, and Tall

Overview

In this first lesson of Math Explorers: Measure, Graph, Solve, students compare the length and height of familiar objects. They build on informal measurement experiences by lining up endpoints and using the words longer, shorter, taller, and same.

Learning intentions

Students will be able to:

• Compare how long or tall two objects are.
• Line up the ends of objects to compare them fairly.
• Use the words long, short, tall, and same.
• Explain or show which object is longer, shorter, taller, or the same length.

Success criteria

• I can line up the ends of two objects.
• I can point to, say, or select the longer, shorter, taller, or same object.
• I can compare at least four out of five examples correctly.
• I can explain that objects with equal lengths are the same length.

Curriculum links

• Measurement and Data — measure length using appropriate tools and compare objects.
• Measurement and Data — solve length comparison problems using drawings, objects, and equations or symbols for unknowns.
• Measurement and Data — represent whole-number lengths from zero on a number line.
• Measurement and Data — organize and interpret simple categories of information.

Lesson structure (30 minutes)

1. 0–3 min · Hook and learning intention. Teacher opens the hook and learning intention slides with a visual comparison of a very long pencil and a short pencil, then says, “Today we are learning: I can compare how long or tall things are.” Students look closely, turn to a partner, and point to the longer or shorter object.

2. 3–8 min · I do: model fair comparison. Teacher shows two classroom objects, such as pencils, and deliberately places them unevenly before correcting the position by lining up their ends; teacher models the sentence, “This pencil is longer. This pencil is shorter.” Students watch, copy the hand motion for lining up ends, and repeat the comparison words.

3. 8–15 min · We do: compare and sort. Teacher uses the sorting activity slides to display picture cards of pencils, blocks, and towers, asking, “Which is longer, shorter, taller, or the same?” Students take turns dragging or directing the teacher to place each card in the LONGER, SHORTER, or SAME column, then compare matching real objects at their desks. Teacher prompts, “Did we line up the ends?” and checks that students distinguish length from height.

4. 15–18 min · Guided practice directions. Teacher demonstrates the three-pair task on the guided practice instruction slide and distributes the picture comparison worksheet. Each student receives three pairs of large, high-contrast object pictures or real objects and practices lining up the ends before choosing an answer. Students may point, speak, circle, or select a response.

5. 18–26 min · You do: individual comparisons. Teacher works briefly with each of the three students, presenting three pairs: pencils, towers or blocks, and ribbons or sticks. Students compare each pair and answer longer, shorter, taller, or same; teacher records accuracy and notes whether each student lines up endpoints independently, with a prompt, or with hand-over-hand support.

6. 26–30 min · Assessment and close. Teacher displays and reads aloud the review and exit-question slides and records each student’s responses to the five questions below. Students answer by pointing, saying the letter or word, or selecting a picture, then complete a quick oral reflection: “I can compare things by ___.”

Resources

• the complete comparison slide deck
• the picture comparison worksheet
• Two pencils of different lengths and two equal-length sticks
• Blocks, ribbons, and small classroom towers
• Three labeled sorting areas: LONGER, SHORTER, SAME
• Large, high-contrast picture cards of pencils, blocks, towers, and ribbons
• Optional pointer, tablet, or Smartboard stylus
• Teacher observation checklist

Assessment

• During modeling and sorting, ask students to explain or demonstrate why objects must be lined up at the ends. Listen for correct use of longer, shorter, taller, and same.
• During guided practice, assess each student’s three comparisons and record whether the response was independent, prompted, pointed, or selected.
• Read aloud the five-item exit check. The target is at least four correct responses:

1. Which pencil is longer? A. short pencil B. long pencil C. same pencils

2. Which tower is taller? A. tall tower B. short tower C. flat block

3. Which ribbon is shorter? A. long ribbon B. short ribbon C. tall ribbon

4. What do we do first? A. line up ends B. hide objects C. count letters

5. Two equal sticks are… A. different B. same length C. taller

Differentiation

• For students needing support, use large, high-contrast objects, physically model each comparison, and offer two choices before offering three. Provide hand-over-hand assistance for lining up ends when needed.
• Read every direction, question, and answer choice aloud. Allow students to point, select a picture, gesture, or answer orally rather than requiring written responses.
• Use large sans-serif print, picture symbols, minimal text, strong spacing, and uncluttered worksheet pages for dyslexia-friendly access. Do not use timed reading.
• For students ready for more challenge, include equal objects in different positions and ask them to prove that the position does not change the length. Invite them to draw the objects and label longer, shorter, or same.