600,000 + 70,000 + 9,000 + 5 looks long, yet it is just one number. This 3rd grade writing numbers from expanded form worksheet asks children to put the pieces back together. There are four sums written in expanded form: one with four digits, one with five and two with six. For each one, your child writes the number in standard form, the usual way with digits and commas. A second page gives the answer key, with a place value chart for the first two.