Converting numbers to words

Description

Reading and writing numbers in words is a basic numeracy skill required in worded problems and financial contexts.

Place value columns:

Millions	Hundred thousands	Ten thousands	Thousands	Hundreds	Tens	Units
2	4	3	1	0	5	7

Written: two million, four hundred and thirty-one thousand and fifty-seven

Rules:

• Use "and" after hundreds: 305 → "three hundred and five"
• Hyphens for 21–99: 47 → "forty-seven"
• Don't write "and" between thousands and hundreds: 3400 → "three thousand four hundred" (no "and")

Decimals in words: $$3.75 \to \text{three point seven five}$$

Common number words to know:

• 1000 = one thousand
• 1 000 000 = one million
• 1 000 000 000 = one billion

Common error: writing "one hundred and fifty thousand" as the number 100,050,000 — always check place value.

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