Place value chart
Draw a chart with periods grouped in threes (ones, thousands), with commas between them. Kids write each digit in its column and read the number period by period: "forty-five thousand, three hundred twelve." Seeing the periods makes even a six-digit number easy to read.
Why it works: pairing a picture with each word gives kids two ways to remember it, a well-tested principle of how people learn (Mayer, 2009).
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