# 2 Math 3 - Place Value, Counting, and Comparison of Numbers to 1000

## Gate

Shadows are corrupting the land. Restore the balance of nature by exploring place value. Gate guides students in: Lowering intimidation about large numbers and decimals. Understanding the meaning of place value. Realizing that the same mathematical concepts that apply to the "easy" integers apply to every order of magnitude.

## Whole Number Subtraction (Online Textbook)

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Have you ever seen seals at the zoo? They are fascinating animals.

Jonah loves working with the seals. In fact, he learns more and more about them every day. One day when he arrived at work, Jonah discovered that there had been a new baby seal pup born the night before. The workers at the zoo had weighed the new pup and his mother just that morning. The mother seal had weighed 157 pounds when she had been weighed alone. The combined weight of both the Mother and pup was 171 pounds.

What did the new pup weigh?

## Whole Number Addition (Online Textbook)

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Have you ever been to the zoo? Have you ever had to add whole numbers to solve a problem? Adding whole numbers is a skill that can help you to solve many real - world problems. Jonah is a student volunteer at the city zoo. He is working with the seals. Jonah loves his job, especially because he gets to help feed the seals who live at the zoo. There are 25 female and 18 male seals. In order to figure out how much to feed them, he will need to know the total number of seals. Use what you will learn in this Concept to help Jonah figure out the total number of seals.

## Number Sense (2004)

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Uses concrete examples to explain common math concepts such as the difference between odd and even numbers, < & > signs, and place value. Discusses counting tricks - making patterns and skip counting, comparing and ordering numbers, and estimation.