Maryland Math 1.NOS.E.13.c

Math1st GradeNumber and Operation Sense

The Standard

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

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.

Teacher's field guide

What Students Need to Do: Students show a subtraction of tens with objects or a drawing. They explain what was taken away and how their model shows the amount left.
What Mastery Looks Like: For 70 − 30, a student draws seven groups of ten and crosses out three groups. They write 40 and explain that four groups of ten remain.
Common Misconceptions: Students may answer 4 instead of 40 because they forget each group stands for ten. Others count the crossed-out groups instead of the groups left.
How to Assess It: Give students 60 − 20. Ask them to draw tens, cross out what is taken away, and write one sentence explaining their answer.

Lesson moves

Give pairs seven bundles of ten sticks, have them remove three bundles, then record and explain 70 − 30.
Ask partners, “In 80 − 50, what does the 5 stand for?” Have them use a drawing to explain what remains.
Make cards with 80 − 30 and 60 − 20; pairs draw one, jump back by tens on a number line, and compare explanations.
Show seven strips of ten stickers, say two strips were given away, and ask students to sketch and explain how many stickers remain.

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