Place Value & Powers of 10 — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
The expanded form of 450,200 is 400,000 + 50,000 + 200 + 0.
Corrected: The expanded form of 450,200 is 400,000 + 50,000 + 200. You do not include + 0 for places with no value.
The corrected sentence is: "The expanded form of 450,200 is 400,000 + 50,000 + 200. You do not include + 0 for places with no value.". The original sentence "The expanded form of 450,200 is 400,000 + 50,000 + 200 + 0." contained an error that needed to be fixed.
2. Fix the sentence:
Three hundred six thousand forty is written as 360,040.
Corrected: Three hundred six thousand forty is written as 306,040. The word "six" follows "three hundred," meaning 306 thousands.
The corrected sentence is: "Three hundred six thousand forty is written as 306,040. The word "six" follows "three hundred," meaning 306 thousands.". The original sentence "Three hundred six thousand forty is written as 360,040." contained an error that needed to be fixed.
3. Fix the sentence:
The word form of 1,080,500 is one million eighty-five hundred.
Corrected: The word form of 1,080,500 is one million eighty thousand five hundred. "Eighty-five hundred" changes the value.
The corrected sentence is: "The word form of 1,080,500 is one million eighty thousand five hundred. "Eighty-five hundred" changes the value.". The original sentence "The word form of 1,080,500 is one million eighty-five hundred." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Write 700,000 + 40,000 + 3,000 + 90 + 1 in standard form: 743,091.
The correct answer is '743,091'. Write 700,000 + 40,000 + 3,000 + 90 + 1 in standard form: 743,091.
2. Write 205,060 in expanded form: 200,000 + 5,000 + 60.
The correct answer is '200,000 + 5,000 + 60'. Write 205,060 in expanded form: 200,000 + 5,000 + 60.
3. Write 4,300,000 in word form: four million three hundred thousand.
The correct answer is 'four million three hundred thousand'. Write 4,300,000 in word form: four million three hundred thousand.
4. Write nine hundred twelve thousand four hundred five in standard form: 912,405.
The correct answer is '912,405'. Write nine hundred twelve thousand four hundred five in standard form: 912,405.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Write the number 6,078,010 in both expanded form and word form.
Sample answer: Expanded form: 6,000,000 + 70,000 + 8,000 + 10. Word form: six million seventy-eight thousand ten.
A good answer is: "Expanded form: 6,000,000 + 70,000 + 8,000 + 10. Word form: six million seventy-eight thousand ten.". Use complete sentences and include details from what you learned.
2. A student wrote the expanded form of 509,300 as 500,000 + 9,000 + 300. Is the student correct? Explain.
Sample answer: Yes, the student is correct. 500,000 + 9,000 + 300 = 509,300. All other place values are zero so they are not included.
A good answer is: "Yes, the student is correct. 500,000 + 9,000 + 300 = 509,300. All other place values are zero so they are not included.". Use complete sentences and include details from what you learned.