All the solutions provided in McGraw Hill Math Grade 4 Answer Key PDF Chapter 1 Lesson 2 Read and Write Multi-Digit Numbers will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 4 Answer Key Chapter 1 Lesson 2 Read and Write Multi-Digit Numbers
Math in My World
Example 1
Scientists found that a gooney bird once traveled 24,983 miles in just 90 days. Use a place-value chart to read the number of miles that the gooney bird traveled.
The place-value chart shows 24,983
The comma is after the thousands period. Say thousand when reading the number.
Say: twenty-four thousand, nine hundred eighty-three
So, the gooney bird traveled twenty-four thousand, nine hundred eighty-three miles.
There are different ways to write numbers. Standard form, or number names, only uses digits to show the number. Expanded form shows the number as a sum of the values of each digit. Word form shows the number only using words.
Example 2
The population of Botswana is about 1,882,000. Write this number in standard form, expanded form, and word form.
The place-value chart shows the place of each digit.
Write the number in standard form and expanded form.
1,000,000 + ____ + 80,000 + ____ ← expanded form
Write the number in word form.
one million, ____ hundred eighty- ___ thousand
Answer:
1,882,000 in the standard form is 1, 882,000.
1,882,000 in the expanded form is 1,000,000 + 800,000 + 80,000 + 2,000.
1,882,000 in the word form is one million eight hundred eighty two thousand.
Talk Math
What is the value of the 6 in 345,629?
Answer:
The value of 6 in the 345,629 is 600.
Here the 6 is in the hundreds place.
Guided Practice
Write each number in standard form.
Question 1.
three hundred forty-nine thousand, twenty-five _____
Answer:
The standard form of three hundred forty-nine thousand, twenty-five is 349025.
Question 2.
400,000 + 90,000 + 2,000 + 800 + 10 + 4 ____
Answer:
The standard form of 400,000 + 90,000 + 2,000 + 800 + 10 + 4 is 492,814
Write each number in expanded form and word form.
Question 3.
492,032
___________
Answer:
492,032 in the expanded form is 400,000 + 90,000 + 2,000 + 0 + 30 + 2
492,032 in the word form is Four hundred ninety two thousand thirty two.
Question 4.
3,028,002
Answer:
3,028,002 in the expended form is 3,000,000 + 0 + 20,000 + 8000 + 0 + 0 + 2
3,028,002 in the word form is three million twenty eight thousand two.
Independent Practice
Write each number in standard form.
Question 5.
twenty-five thousand, four hundred eight ____
Answer:
Twenty-five thousand, four hundred eight in standard form is 25,800
Question 6.
forty thousand, eight hundred eleven ____
Answer:
Forty thousand, eight hundred eleven in standard form is 40,811.
Question 7.
seven hundred sixty-one thousand, three hundred fifty-six ____
Answer:
Seven hundred sixty-one thousand, three hundred fifty-six in standard form is 761,356
Question 8.
five million, seven hundred sixty-two thousand, one hundred eleven ____
Answer:
Five million, seven hundred sixty-two thousand, one hundred eleven in standard form is 5,762,111.
Question 9.
600,000 + 80,000 + 4 _____
Answer:
600,000 + 80,000 + 4 in standard form is 680,004.
Question 10.
20,000 + 900 + 70 + 6 ____
Answer:
20,000 + 900 + 70 + 6 in standard form is 20,976.
Question 11.
9,000,000 + 200,000 + 1,000 + 500 + 2 ____
Answer:
9,000,000 + 200,000 + 1,000 + 500 + 2 in standard form is 9,200,502.
Write each number in expanded form and word form.
Question 12.
485,830
Expanded Form:
______________
Word Form:
______________
______________
Answer:
485,830 in expanded form is 400,000 + 80,000 + 5,000 + 800 + 30 + 0
485,830 in word form is four lakhs eighty five thousand eight hundred and thirty.
Question 13.
3,029,251
Expanded Form:
______________
Word Form:
______________
______________
Answer:
3,029,251 in expanded form is 3,000,000 + 0 + 20,000 + 9,000 + 200 + 50 + 1
3,029,251 in standard form is three million twenty nine thousand two hundred and fifty one.
Problem Solving
Question 14.
Mathematical PRACTICE 1 Plan Your Solution A zoo’s newborn African elephant weighed 232 pounds. After one year, the elephant gained 1,000 pounds. Write the elephant’s new weight in expanded form and word form.
Expanded form: _______
Word Form: __________
Answer:
Given that,
The newborn African elephant weighed 232 pounds.
After one year, the elephant gained 1,000 pounds.
The expended form of the 1000 is 1000.
The word form of 1000 is thousand.
Question 15.
The population of Norway is about four million, seven hundred two thousand. Write this number in standard form.
Answer:
The four million, seven hundred two thousand in standard form is 4,702,000.
Question 16.
The population of the Dominican Republic is about 9,366,000. Write this number in word form.
Answer:
9,366,000 in word form is nine million three hundred and sixty six thousand.
HOT Problems
Question 17.
Mathematical PRACTICE 3 Find the Error Sonia wrote the expanded form of 2,408,615 below.
2,000,000 + 1100000 + 80,000 + 600 + 1o + 5
Find and correct her mistake.
Answer:
2,408,615 in expanded form is 2,000,000 + 400,000 + 0 + 8,000 + 600 + 10 + 5
Question 18.
? Building on the Essential Question Why is expanded form important? Explain.
Answer:
The expanded form is very important because it is depends on the place value.
The expanded form splits the number by units, tens, hundreds and thousands place.