Maryland Math 1.NOS.E.13
Standard Cluster
Subtract a 1-digit number from a 2-digit number (without regrouping). Use concrete models or drawings to subtract. Use counting strategies, properties of operations, and/or the inverse relationship between addition and subtraction to subtract. Represent and explain the calculation by connecting the strategy used to the meaning of subtraction.
Maryland College and Career Ready Standards for Mathematics (2025) · USE PLACE VALUE UNDERSTANDING AND PROPERTIES TO ADD AND SUBTRACT.
Cluster contents
Standards in This Cluster
1.NOS.E.13 is a cluster heading. These are the individual standards under it.
- 1.NOS.E.13.a
Use concrete models or drawings to subtract.
- 1.NOS.E.13.b
Use counting strategies, properties of operations, and/or the inverse relationship between addition and subtraction to subtract.
- 1.NOS.E.13.c
Represent and explain the calculation by connecting the strategy used to the meaning of subtraction.
Teacher's field guide
What This Cluster Means
What Students Need to Do
- Students subtract a one-digit number from a two-digit number when there are enough ones to take away. They use blocks or drawings to show what they remove, then explain how they found the answer.
What Mastery Looks Like
- For 36 − 4, a student removes four ones and gets 32. They can also count back four or use 32 + 4 = 36, and explain why the three tens stay.
Common Misconceptions
- Some students count 36 as the first step back and get 33 instead of 32. Others remove a ten when they only need to remove ones.
How to Assess It
- Exit ticket: Solve 47 − 5. Draw tens and ones, cross out what you remove, write the answer, and explain why the tens stay the same.
Lesson moves
Ways to Teach It
Have pairs build 48 with base-ten blocks, remove six single cubes, and write the matching subtraction equation.
Ask, “Why do the tens stay the same in 48 − 6?” Have students draw a model and write one sentence.
Play a card game: build a two-digit number with digit cards, subtract a smaller digit from its ones, and check by addition.
Draw a shelf with 26 library books. Say three are checked out, then have students draw tens and ones to find how many remain.
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Printable 1.NOS.E.13 Worksheet
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Related Standards
- 1.NOS.E.10
Add within 100 including adding a two-digit number and a one-digit number and adding a two-digit number and a multiple of 10. Understand that when adding two-di...
- 5.NOS.B.5
Divide multi-digit whole numbers with up to four-digit dividends and two-digit divisors.
- 4.NOS.B.5
Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers.
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