Place Value and Rounding — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Write 45,012 in word form: forty-five thousand, twelve
After forty-five thousand, the remaining part is 12, which is written as twelve. There are no hundreds, so you skip straight to twelve.
2. The standard form of three million, two hundred six thousand, nine is 3,206,009
Three million is 3,000,000, two hundred six thousand is 206,000, and nine is 9. Adding them gives 3,206,009, with zeros holding the tens and hundreds places.
3. Write the expanded form of 708,430: 700,000 + 8,000 + 400 + 30
The thousands digit in 708,430 is 8, so the missing part of the expanded form is 8,000. The zero in the ten-thousands place means that value is skipped.
4. The word form of 1,050,200 is one million, fifty thousand, two hundred.
The thousands part of 1,050,200 is 050, which equals fifty thousand. The zero in the hundred-thousands place means you only say fifty, not one hundred fifty.
5. 860,475 rounded to the nearest ten-thousand is 860,000
The thousands digit is 0, which is less than 5, so the ten-thousands digit stays at 6 and 860,475 rounds down to 860,000.
6. The standard form of 9,000,000 + 100,000 + 20,000 + 800 + 50 + 3 is 9,120,853
Add each part together: 9,000,000 + 100,000 + 20,000 + 800 + 50 + 3 = 9,120,853. The thousands and ten-thousands places combine to form 120,000.
7. In word form, 620,015 is six hundred twenty thousand, fifteen
The last three digits are 015, which is fifteen. The zero in the hundreds place means there are no hundreds to write in words.
8. 5,490 rounded to the nearest hundred is 5,500
The tens digit is 9, which is 5 or greater, so the hundreds digit rounds up from 4 to 5, giving 5,500.
9. The expanded form of 2,007,300 is 2,000,000 + 7,000 + 300
The thousands digit in 2,007,300 is 7, so the missing part is 7,000. The hundred-thousands and ten-thousands places are both zero, which is why they are skipped in expanded form.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
504,060 in word form
→ five hundred four thousand, sixty
3,080,201
3,000,000 + 80,000 + 200 + 1
→ 3,080,201
1,500,046
seventy thousand, nine hundred
→ 70,900
70,900
1,000,000 + 500,000 + 40 + 6
→ 1,500,046
five hundred four thousand, sixty
Correct matches: 504,060 in word form → five hundred four thousand, sixty; 3,000,000 + 80,000 + 200 + 1 → 3,080,201; seventy thousand, nine hundred → 70,900; 1,000,000 + 500,000 + 40 + 6 → 1,500,046.