Compare numbers within 1000. You may start with base-ten blocks or compare by plotting on the number line. Eventually, move towards comparing numerals using place value. That is, compare hundreds, then tens, then ones.
Conclude by leading this investigation:
Find the Attribute
2.NBT.A.4: Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.