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# 1st Grade Subtraction Bar Model Math Center

Common Core Standards
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2 MB|19 pages
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Product Description
Guide students through the Concrete, Pictorial, and Abstract stages of mathematical thinking with this hands-on Part-Whole Bar Model Subtraction Math Center! Help young mathematicians transition directly from concrete bar models using manipulatives, to pictorial bar model drawings, to the basic subtraction algorithms. This Concrete, Pictorial, and Abstract method is research-based and proven to be effective.

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What does the math center include?

This math center includes 15 different worksheets of subtraction word problems within 10 that invite students to create bar models with Unifix cubes, draw the remaining cubes, create number bonds with two parts and a whole, complete bar model drawings, and create and solve 2 different addition sentences that match the word problems. Also includes student center directions in kid-friendly "I can statements" and teacher directions following the gradual release of responsibility method.

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How does it lead students through the Concrete, Pictorial, and Abstract Stages?

Concrete: Students will physically create the whole number of each subtraction story problem using Unifix cubes. Then they will remove cubes to solve for the missing part.
Pictorial: Students will draw the leftover cubes, complete the bar model, and solve for the missing part on the dice number bond by subtracting the part from the whole.
Abstract: Students will create 2 different subtraction sentences that match the story problem & create the appropriate number bond using numerals to represent the two parts and the whole.

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Why bar models?

This math center is great for introducing students to the bar model drawing process which is becoming more widely adopted in schools across the country. Bar model drawing is part of an effort to set students up for algebraic thinking in the higher grades. Each concrete bar model that your students create will match the bar model drawing on each page. In this way, it serves as a great visual introduction to the bar model drawing process!

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How Can I Use Them In The Classroom?

They are designed to be used at math centers, however they can also be used as warm-ups at the beginning of math class or they can be used during independent or guided practice. The ‘Teacher Directions’ will carefully guide you through the gradual release of responsibility method when introducing this center to your students.

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What Common Core is Covered?

1.0A.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.

1.OA.C.6: Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

2.0A.B.2: Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.

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What do I need to provide?

You will need to provide the Unifix cubes.

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Total Pages
19 pages
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