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The Power of Ten and Place Value · Quarter 2

Adding Multiples of Ten

Students add multiples of 10 to two-digit numbers using concrete models and mental math strategies.

Key Questions

  1. Explain how adding a multiple of ten only changes the tens digit.
  2. Predict the outcome when adding 10, 20, or 30 to a given number.
  3. Design a mental strategy for quickly adding multiples of ten.

Common Core State Standards

CCSS.Math.Content.1.NBT.C.4CCSS.Math.Content.1.NBT.C.5
Grade: 1st Grade
Subject: Mathematics
Unit: The Power of Ten and Place Value
Period: Quarter 2

About This Topic

Directions and Symbols teaches students the 'language' of maps. By learning the cardinal directions (North, South, East, West) and how to use a map key, children gain the tools to navigate and interpret geographic information. This topic builds logical thinking and the ability to translate symbols into real-world objects.

This unit meets standards for using geographic tools. It moves students from simple picture maps to more formal cartographic representations. This topic is highly interactive, as students can use their own bodies to find directions and create their own symbols for familiar classroom objects.

Active Learning Ideas

Watch Out for These Misconceptions

Common MisconceptionNorth is 'up' toward the ceiling.

What to Teach Instead

Explain that North is a direction on the ground toward the North Pole. Using a compass on a flat table helps students see that directions are horizontal, not vertical. Active 'direction hunts' outside can also help ground this concept.

Common MisconceptionMap symbols must look exactly like the real thing.

What to Teach Instead

Show how a simple green circle can represent a whole tree or a blue line can represent a wide river. Active 'symbol simplified' drawing exercises help students understand that symbols are a shorthand code.

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Frequently Asked Questions

How do I teach North, South, East, and West to 6-year-olds?
Use a mnemonic like 'Never Eat Soggy Waffles' and associate each direction with a permanent landmark in your school or town. Physical movement, like turning your body to face each direction, is the most effective way to build this 'internal compass.'
Why do maps use keys instead of just writing the words?
Explain that maps would get too crowded and messy with words everywhere. Symbols make maps easier to read quickly, like a secret code that everyone can learn. This introduces the idea of efficiency in communication.
How can active learning help students understand map symbols?
When students create their own symbols for a classroom map, they learn the 'why' behind cartography. They realize that a symbol needs to be simple and recognizable, which helps them decode professional maps more easily later on.
What is a compass rose?
A compass rose is a design on a map that shows directions. In 1st grade, we focus on the four main points. Telling students it's like a 'star that points the way' helps them remember its purpose on a map.

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