Addition and Subtraction with Decimal Numbers – Foundational Numeracy

WATCH THE VIDEO OF THE COMPLETE ACTIVITY

⚠️ This adapted Mathematics activity was designed to teach Addition and Subtraction with Decimal Numbers to students who are in the process of learning to read and write, using everyday situations, visual support, and structured calculations.

Number of questions in the activity:

4 adapted questions + complete answer key, distributed across 2 activity pages.

The sequence begins by identifying correctly solved operations, progresses to adding prices and performing vertically arranged calculations, and concludes with a word problem involving the total cost of a purchase and the change received.

Target audience:

Especially suitable for students who are in the process of learning to read and write, and can be used in Elementary School, Middle School, and High School, depending on the student's curricular adaptation needs.

It may be particularly helpful for students with:

• Mild Intellectual Disabilities who recognize numbers and basic operations but need concrete examples.

• Dyscalculia who may benefit from structured calculations and support in understanding place value.

• ADHD who experience difficulties with attention and organizing mathematical procedures.

• Reading and writing difficulties who need short instructions and primarily numerical responses.

The material can also support Mathematics and Specialized Educational Support (AEE) teachers.

Format:

Ready-to-print PDF containing:

🔹 4 adapted questions and a complete answer key;
🔹 2 activity pages;
🔹 addition and subtraction operations involving decimal numbers;
🔹 images of products with prices in Brazilian reais;
🔹 word problems involving shopping and making change;
🔹 vertically arranged calculations;
🔹 activities involving marking answers and completing numerical results;
🔹 versions with standard lettering and UPPERCASE lettering;
🔹 black-and-white version;
🔹 BNCC-related skills.

⏱️ Save approximately 2 hours and 48 minutes of preparation time! The material is already adapted, illustrated, formatted, and accompanied by a complete answer key, reducing the time needed to develop calculations, select images, and organize accessible activities.

Content covered:

1. Checking mathematical operations: Identifying addition and subtraction problems with correct results.

2. Adding prices: Adding the cost of a carton of milk priced at R$ 4.50 and a loaf of bread priced at R$ 3.00, totaling R$ 7.50.

3. Vertical calculations: Solving four operations involving reais and cents.

4. Shopping and making change: Calculating the total cost of R$ 7.50 for a notebook and a pen, then identifying the R$ 2.50 change from a R$ 10.00 payment.

Important information for teachers:

The activity follows a progressive learning sequence, beginning with recognizing correct results and gradually introducing calculations and contextualized word problems.

In the first question, students analyze four mathematical operations and mark those with correct results, developing attention and calculation-checking skills.

In the second question, students observe a carton of milk and a loaf of bread with their respective prices and identify the total cost of the purchase from four answer choices.

In the third question, students solve four vertically arranged operations: 2.50 + 1.50; 6.00 − 2.00; 2.50 + 2.50; and 5.50 − 2.50. Separate boxes help organize mathematical procedures and numerical entries.

In the fourth question, students calculate the total price of a notebook and a pen and then determine the change received after payment. This situation allows students to practice addition and subtraction in two steps, connecting mathematical operations to an everyday shopping experience.

The UPPERCASE instructions, highlighted monetary values, and spaces for completing results support the participation of students who still need assistance with reading.

Key features:

✅ Functional Mathematics: Operations connected to shopping, prices, and making change.

✅ Progressive learning: From identifying correct results to solving word problems.

✅ Visual support: Product illustrations and highlighted monetary values.

✅ Structured calculations: Enlarged operations organized in separate boxes.

✅ Reduced writing demands: Answers completed by marking choices and entering numerical values.

✅ Accessibility: Available in UPPERCASE and black-and-white versions, with a complete answer key.