Skip to content
Numerical Relationships and Algebraic Thinking · Quarter 1

Subtraction: Finding the Difference

Students explore subtraction as comparing two quantities to find how many more or how many fewer.

Key Questions

  1. Compare the 'taking away' method with the 'finding the difference' method for subtraction.
  2. Explain how a number line can help visualize the difference between two numbers.
  3. Justify why subtraction is the inverse operation of addition.

Common Core State Standards

CCSS.Math.Content.1.OA.A.1CCSS.Math.Content.1.OA.C.6
Grade: 1st Grade
Subject: Mathematics
Unit: Numerical Relationships and Algebraic Thinking
Period: Quarter 1

About This Topic

How Families Change introduces students to the concept of continuity and change over time. By comparing their own lives to those of their parents or grandparents, children begin to understand how technology, transportation, and daily chores have evolved. This topic bridges the gap between personal experience and historical study, helping students see themselves as part of a larger timeline.

This topic aligns with standards that require students to distinguish between the past and the present. It encourages them to look for evidence of change in the world around them. Students find this concept most engaging when they can physically handle 'old' objects or interview older family members, turning history into a detective game.

Active Learning Ideas

Watch Out for These Misconceptions

Common MisconceptionLife in the past was 'boring' because they didn't have iPads.

What to Teach Instead

Help students see the creative ways people played and worked in the past. Active role play of historical games can show that while tools change, the human desire for fun and connection does not.

Common MisconceptionThe past was hundreds of years ago; my parents didn't live in the past.

What to Teach Instead

Students often struggle with the scale of time. Using a 'Family Decade' timeline helps them see that 'the past' includes yesterday, last year, and the time when their parents were children.

Ready to teach this topic?

Generate a complete, classroom-ready active learning mission in seconds.

Frequently Asked Questions

How do I explain 'the past' to a six-year-old?
Use concrete examples. Start with 'yesterday' and 'when you were a baby.' Then move to 'when your teacher was in first grade.' Relating time to people they know makes the abstract concept of history feel more real.
What are good artifacts to show 1st graders for 'Then and Now'?
Look for items with clear modern versions: a rotary phone vs. a smartphone, a paper map vs. a GPS, or a feather pen vs. a ballpoint pen. Physical objects that students can touch provide a powerful sensory connection to history.
How can active learning help students understand how families change?
Active learning, like matching games or 'then and now' simulations, forces students to look for specific differences and similarities. Instead of just hearing that things changed, they have to analyze the evidence themselves, which builds critical thinking and historical inquiry skills.
Does this topic cover sensitive historical changes?
At this level, the focus is on daily life and technology. However, it provides a foundation for later grades to discuss more complex social changes. It is a good time to mention that while some things get easier, we always work to make things fairer for everyone.

Browse curriculum by country

AmericasUSCAMXCLCOBR
Asia & PacificINSGAU