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Math Unit 1: Addition, Subtraction & Place Value

Math Unit 1: Addition, Subtraction & Place Value

Author: Cameron Clark

I can recognize that in a whole number, a digit in one place represents ten times what it represents in the place to its right.

I can read and write whole numbers less than or equal to 1,000,000 using base-ten numerals, number names, and expanded form.

I can compare two whole numbers using >, =, and < symbols.

I can use place value to round whole numbers less than 1,000,000 to any place.

I can add and subtract whole numbers using the standard algorithm.

The focus of this unit is to provide students time to develop and practice efficient addition and subtraction of multi-digit whole numbers whil developing place value concepts.

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What is this?

Below you will find links and resources for our Math Unit 1.


  • LearnZillion is a video resource that has student-friendly videos of the concepts we are covering in class. They provide visual models and examples.


  • ShowMe are videos that I have made using the vocabulary we used in the classroom. You can watch these to see how I teach the concepts.


  • IXL is a website that students can use to practice the math concepts. Students each have their own login and password for the IXL site. Their login is their computer login followed by @rdes. (Example: cclark@rdes) Their password is the same password they use to login to the computers at school.

Vocabulary for the Unit

Place Value: the value of where the digit is in the number

4th Grade Place Values: Ones, Tens, Hundreds, Thousands, Ten Thousands, Hundred Thousands, Millions

Base-ten Numerals: this is another name for the decimal number system that we use everyday; standard form (Example: 2,357)

Expanded Form: writing a number to show the value of each digit (Example: 4,265 = 4,000 + 200 + 60 + 5)

Word Form: a way to write the number using words (Example: 235 is two hundred thirty five)

Rounding: reducing the digits in a number while trying to keep its value similar. (Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80.)

Regrouping: rearrange the formation of a group; used to assist when trading or carrying in addition and subtraction (For visual example, go to this link, click on R on the lefthand side and regroup.)

Sum: the result of adding two or more numbers (Example: If you add 2 and 3, the sum is 5.)

Difference: the result of subtracting one number from another (Example: The difference between 8 and 3 is 5.)