Printable Light Brightness Worksheet | Grade 1 Science

This worksheet provides first-grade students with focused practice on observing and comparing the brightness of different light sources. Through a set of clear, sequential tasks, learners will develop their scientific observation skills by ranking the intensity of candlelight and then applying that concept to draw different light bulbs.

At a Glance

• Grade: 1 · Subject: Science
• Standard: 1-PS4-2 — Make observations to understand how light allows objects to be seen.
• Skill Focus: Comparing Light Brightness
• Format: 1 page · 2 problems · Answer key included · PDF
• Best For: Introduction to light properties, observation practice
• Time: 10–15 minutes

What's Inside

This single-page, downloadable PDF contains a concise and engaging lesson on light properties. The worksheet is divided into two parts: a "Science activity" where students rank three candles by brightness and a "Science exploration" task where students draw light bulbs of varying intensity. An answer key is included for easy review.

A Progression of Skill

The worksheet follows a logical progression reflecting a gradual release of responsibility model.

• Guided practice: The initial "Observations" section provides background reading, establishing a shared context about light sources and acting as the "I Do" part of the lesson.
• Supported practice: The main candle activity asks students to apply this knowledge in a structured ranking task, representing the "We Do" phase where they use new information with support.
• Independent practice: The final drawing task serves as the "You Do," allowing students to independently demonstrate their understanding of the concept of varying light intensity.

Standards Alignment

This resource aligns with NGSS standard 1-PS4-2, where students "Make observations to construct an evidence-based account that objects can be seen only when illuminated." This worksheet provides foundational practice in observing the properties of light sources, a critical precursor skill. The standard code can be copied directly into lesson plans or curriculum maps.

How to Use It

Use this worksheet as a 'check for understanding' after a lesson on light. It works well following a direct instruction or a hands-on science demonstration. For formative assessment, observe students' ability to rank the candles and their use of comparative vocabulary like 'brighter'. The activity should take 10-15 minutes.

Who It's For

Designed for first-grade students, the worksheet's clear visuals support all learners, including ELLs. For differentiation, have students discuss rankings in pairs before writing their answers. This activity pairs well with a classroom anchor chart that defines different sources of light.

This Grade 1 science worksheet offers focused practice aligned with NGSS standard 1-PS4-2, helping students build foundational skills in scientific observation by comparing the brightness of different light sources. The worksheet’s design, which moves from a shared observation to a structured ranking task and finally to an independent drawing exercise, mirrors the effective gradual release of responsibility framework described by Fisher & Frey (2014). This approach scaffolds learning by providing initial support and then systematically fading it as students gain confidence. Such targeted skill practice is essential in early elementary science, as it builds the observational and analytical habits necessary for more complex scientific inquiry in later grades. By providing a concrete task—ranking candles by light intensity—the worksheet makes the abstract concept of brightness tangible and accessible for young learners.