Maryland Math 1.NOS.E.13.a

Math1st GradeNumber and Operation Sense

The Standard

1.NOS.E.13: Subtract a 1-digit number from a 2-digit number (without regrouping).

Use concrete models or drawings to subtract.

Maryland College and Career Ready Standards for Mathematics (2025) · USE PLACE VALUE UNDERSTANDING AND PROPERTIES TO ADD AND SUBTRACT.

Teacher's field guide

What Students Need to Do: Students use objects or drawings to show a starting amount. They take some away, count what remains, and write a subtraction equation.
What Mastery Looks Like: Given 13 minus 5, a student can draw 13 marks, cross out 5, and count 8 left. They can point to what was taken away and what remains.
Common Misconceptions: Some students count the crossed-out marks as the answer instead of the marks left. Others draw the wrong starting number or cross out too few marks.
How to Assess It: Exit ticket: There are 12 stickers. You give away 5. Draw what happens and write a subtraction equation.

Lesson moves

Give each pair 14 counters, ask them to remove 6, then sketch the counters left and write an equation.
Ask, 'Sam drew 12 dots, crossed out 5, and said 5 are left. What did Sam count by mistake?'
Start with 15 drawn dots, roll one die, cross out that many dots, and write the subtraction equation; repeat three times.
Put 12 paper lunch tickets on a desk, take away 4, and have students draw and label how many are left.

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