Maryland Math 1.NOS.E.12.a

Math1st GradeNumber and Operation Sense

The Standard

1.NOS.E.12: Subtract a multiple of 10 from another multiple of 10 within 90.

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 build or draw a group, remove or cross out some objects, and count what remains. They use the model to show what each number in a subtraction problem means.
What Mastery Looks Like: Given 13 - 5, a student shows 13 objects, removes 5, and counts 8 left. They can point to the objects taken away and write the matching equation.
Common Misconceptions: Some students count the objects crossed out as the answer instead of the objects left. Others start with 5 objects for 13 - 5 because they focus on the second number.
How to Assess It: On an exit ticket, write 13 - 5 = __. Ask students to draw 13 dots, cross out 5, and fill in the blank.

Lesson moves

Give students 14 counters on two ten-frames; have them remove 6 and count what remains.
Show a drawing of 12 balloons with 4 crossed out; ask students to write what happened and how many remain.
Play subtraction match: students pair cards showing equations with drawings that show the same objects crossed out.
Say, “You have 15 grapes and eat 7.” Have students draw the grapes, cross out 7, and count the rest.

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