Early MathOrder numbers up to 20 from least to greatest
Write each row of numbers in order, least to greatest.
Once children can compare two numbers, the next step is lining up several at once. These free printable worksheets give a small set of numbers up to twenty and ask a child to write them in order from least to greatest.
If they get stuck

The answer key prints on a separate page.
Each question shows a handful of numbers out of order, and the child rewrites them smallest to largest. The set stays close enough together that a child has to compare carefully rather than spot one obvious winner, and every number stays at twenty or below so the row is short enough to sort by hand.
Ordering is a young skill, so each page stays short — a handful of rows is enough focused practice for an early learner.
One question from a sheet like this one, worked a step at a time — with a sentence saying what just happened and why.
Ordering numbers, step by step