Two-Digit Subtraction Within 100: Grade 2 math

What this covers

Two-Digit Subtraction Within 100 is taught in Grade 2 (age 7 to 8) as a topic to introduce. It sits in the Number strand.

Worked example

Difficulty scale

The sheet generator offers five difficulty settings for this topic.

1. Subtracting a 1-digit number from a 2-digit number without crossing ten (e.g., 48 - 5)
2. Subtracting a 1-digit number crossing ten (e.g., 43 - 7)
3. Subtracting multiples of 10 from any 2-digit number (e.g., 74 - 30)
4. Subtracting two 2-digit numbers without borrowing (e.g., 58 - 23)
5. Subtracting two 2-digit numbers with borrowing across ten (e.g., 71 - 38)

Common mistakes

• Subtracting the smaller digit from the larger digit regardless of position (e.g., 52 - 17 -> 2 - 7 becomes 7 - 2 = 5)
• Counting back incorrectly across the decade boundary

Curriculum links

Indicative matches to Common Core State Standards. Check wording and codes against the official document.

• 2.OA.A.1 Use addition and subtraction within 100 to solve one- and two-step word problems.
• 2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value and properties of operations.