1.NBT.B.3
Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Compare two-digit numbers. Use the symbols <, >, and =. You can start with base-ten blocks before comparing written numbers. Conclude by leading this investigation. Here's a partial demonstration. Here's a gentle introduction. Here are answers to some of the questions. Of course, you shouldn't show answers to students until they're done exploring.
TODO: When is not equal to introduced by the Common Core?