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Number Trail Grade 4 / Week 01 / Tuesday
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Week 01 · Big numbers

Tuesday

Read and write big numbers
// Place value to one million
⏱ about 15 min

Tuesday: Read and write big numbers

Bennie finds an old sign at the trail gate.

It says the trail had 305,240 visitors since it opened.

Ferris tilts his head. "How do I even say that number?"

Bennie points to the comma in the middle.

"The comma splits the number into groups of three digits," he says.

"Read the first group, then say thousand at the comma."

"Then read the last group like a normal number."

Ferris tries it slowly, and his tail swishes with pride.

Learn it: three ways to write a number

Standard form uses digits: 305,240.

Number name: three hundred five thousand two hundred forty.

Expanded form adds the value of each digit: 300,000 + 5,000 + 200 + 40.

A zero holds a place, so we skip it in the name and in expanded form.

A place value chart showing 305,240
WHICH IS THE NUMBER NAME?
  • Read the question.
  • Tap your answer.
Which is the number name for 305,240?
Which is the number name for 42,608?
Which is the number name for 710,095?
Which is the number name for 9,004?
WRITE THE NUMBER
  • Read the question.
  • Tap your answer.
Which number is forty-two thousand six hundred eight?
Which number is one hundred thirty thousand five hundred?
Which number is eight hundred six thousand seventeen?
Which number is one million?

Learn it: expanded form

Expanded form shows what each digit is worth. 64,173 = 60,000 + 4,000 + 100 + 70 + 3.

Adding the parts gives the number back.

PUT THE PARTS TOGETHER
  • Read the question.
  • Tap your answer.
4,000 + 500 + 20 + 7 = ?
60,000 + 300 + 8 = ?
200,000 + 5,000 + 90 = ?
700,000 + 30,000 + 1,000 + 400 + 60 = ?
WHICH IS THE EXPANDED FORM?
  • Read the question.
  • Tap your answer.
Which is 60,308 in expanded form?
Which is 415,072 in expanded form?
Which is 9,350 in expanded form?
HOW TO READ 247,315
  • Think about how Bennie reads a big number.
  • Tap the steps in order.
1First
2Next
3Then
4Last
SentenceTrue or false?
300,000 + 5,000 + 200 + 40 = 305,240?
40,000 + 7 = 4,007?
600,000 + 20,000 + 9 = 620,009?
WHY THIS EXERCISE40,000 + 7 is 40,007, not 4,007.
Try it
Write a six-digit number on a piece of paper.
Read it out loud to someone at home.
Ask them to write it while you say it.
Do your two numbers match?
Write 305,240 in standard form and in expanded form.

Well read! Tomorrow we compare big numbers.

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