Subtract 3 Digit Number from 3 Digit - Practice with Fun Math Worksheet In 3 Digit - 3 Digit Worksheet, students subtract 3 digit numbers from 3 digit numbers without regrouping (carry). Common Core Alignment 3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.