Word names for numbers

Learning Objectives Identify the place value of each digit in a whole number up to billions. Identify the place value of each digit in a decimal number up to thousandths. Write any whole number up to billions in its correct word form. Write any decimal number up to thousandths in its correct word form. Convert a number given in word form back into its standard numerical form. Correctly use commas and hyphens when writing numbers in word form. Ever wonder how to write out the number of stars in our galaxy, or the cost of a new car, using only words? 🌌 Let's unlock the secret to expressing huge numbers clearly! In this lesson, you'll learn the essential rules for writing and reading numbers in their word form, from whole numbers to decimals. Mastering this skill is...

TermDefinitionExample Place ValueThe value of a digit based on its position within a number. For example, in 523, the '5' is in the hundreds place, giving it a value of 500.In the number 7,345, the '7' is in the thousands place, '3' in the hundreds, '4' in the tens, and '5' in the ones place. PeriodGroups of three digits in a large number, separated by commas, each with its own name (e.g., ones, thousands, millions, billions).In 123,456,789, '123' is the millions period, '456' is the thousands period, and '789' is the ones period. Word Name (or Word Form)Writing a number using words instead of digits.The word name for 25 is 'twenty-five'. Standard FormWriting a number using digits.The standard form f...

Rule for Whole Number Periods Read each period (group of three digits) as if it were a number by itself, then add the period's name. Start from the leftmost period. When writing large whole numbers, break them into groups of three digits from right to left, separated by commas. Read the number in each group, then state the period name (e.g., billions, millions, thousands, ones). The 'ones' period name is usually omitted. Rule for Hyphenating Compound Numbers Compound numbers between twenty-one and ninety-nine (excluding multiples of ten) are hyphenated. Always use a hyphen when writing numbers like twenty-three, forty-seven, or ninety-nine. Do not hyphenate numbers like one hundred, two thousand, or thirty. Rule for Decimal Numbers Read the whole number...