# 3. 3 Digit - 1 Digit

Practice subtracting 1 digit number from a 3 digit number. This is the same as reducing the number of ones in a number and should be simple for students with a clear understanding of place value concepts. Although the **3 Digit Minus 1 Digit Subtraction Worksheet** starts off with problems that use models for numbers, students should target being mentally proficient. Building mental fluency in such special cases of subtraction helps to contribute towards overall proficiency in subtraction.

### Common Core Alignment

**2.NBT.7**Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.