Place Value to 1,000,000

Unit Review Sheet

Facts and Definitions

Lesson 1: Numbers to 10,000 Review

• Ones place: position on the right in a number
• Tens place: position to the left of the ones place
• Hundreds place: position to the left of the tens place
• Thousands place: position to the left of the hundreds place
• Expanded form: a way to write a number that shows the value of each digit (for example, 4,529=4000+500+20+9)
• Expanded notation: also called super expanded form, expresses a number by showing each digit multiplied by its place value. For example, 4,532 in expanded notation is (4×1,000)+(5×100)+(3×10)+(2×1)

Lesson 2: Reviewing Rounding to 10 and 100

• Rounding: the process of making a number simpler to work with but keeping its value close to the original number

Lesson 3: The Thousands Places

• Base-10 number system: a commonly used number system that is based on 10 digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) and the number 10
• Ten thousands place: position to the left of the thousands place
• Hundred thousands place: position to the left of the ten thousands place
• Numbers of four digits or more require commas. To place commas, start to the right of the ones place and count three places to the left. Repeat as needed starting at the comma and counting three more places to the left.

Lesson 4: One Million

• Millions place: position to the left of the hundred thousands place

Lesson 5: Comparing Big Numbers

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Lesson 6: Rounding Big Numbers

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Lesson 7: Adding and Subtracting Big Numbers

• Estimate: to guess

Lesson 8: Rounding to Estimate

• Rounding to the greatest place means rounding a number to the place on the far left. For example, the number 5692 would be rounded to the thousands place, since the number on the far left is in the thousands place.

Lesson 9: Problem Solving

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Lesson 10: Unit Test

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Final Project: Cross Number Puzzle

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