Operations with Fractions, LCM, and Decimals

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⚠️ This material is an adapted Mathematics activity designed to work with operations involving fractions, Least Common Multiple (LCM), and decimal numbers, while maintaining the mathematical content and providing visual support and step-by-step guidance to make the procedures more accessible.

Number of questions in the activity:

6 adapted questions + complete answer key, distributed across 2 activity pages, with different levels of difficulty.

The activity ranges from identifying the LCM of two numbers to calculations involving addition of fractions with different denominators, addition and division of decimal numbers, a word problem involving decimals, and division of fractions.

Target audience:

The material can be used in Middle School and, depending on the student’s curricular adaptation needs, also in High School.

It is especially recommended for students with mild to moderate Intellectual Disabilities, ASD, ADHD, Down Syndrome, and Mathematics learning difficulties, as well as a resource for mainstream classroom teachers and Specialized Educational Support (AEE) professionals.

Format:

PDF designed for color printing, containing:

🔹 6 adapted Mathematics questions;
🔹 activities involving LCM, fractions, and decimal numbers;
🔹 questions with different levels of difficulty;
🔹 short and objective instructions;
🔹 multiple-choice alternatives;
🔹 specific spaces to organize and perform calculations;
🔹 mathematical procedures divided into steps;
🔹 a word problem with visual support;
🔹 standard writing version;
🔹 UPPERCASE version;
🔹 BNCC-related skills and learning objectives;
🔹 complete answer key with visual solutions.

Content covered:

The activity covers Least Common Multiple (LCM); equivalent fractions; addition of fractions with different denominators; decimal place alignment; addition of decimal numbers; subtraction of decimal numbers in a word problem; division of fractions; converting division into multiplication by the reciprocal; and division involving a decimal number.

Important for the teacher:

One of the main features of this activity is that the adaptation does not eliminate the mathematical challenge. Instead, it changes the way certain procedures are presented.

In question 2, for example, the student must calculate 1/4 + 1/6, but the procedure is divided into steps: first, the student finds the LCM of 4 and 6 and then converts the fractions so that they have the same denominator. Boxes placed in the numerators and denominators also visually indicate where each value should be written.

In question 3, there is a structured space to vertically organize 12.5 + 3.25, helping the student align the decimal places and decimal point correctly. Question 6 provides a similar space for the student to work through the division 24.8 ÷ 4.

Key Features:

✅ Balances simpler and more challenging questions, allowing different levels of mathematical demand within the same activity.

✅ Maintains relevant mathematical content without turning the entire adaptation into overly simplified exercises.

✅ Breaks down multi-step procedures, such as adding fractions, reducing the amount of information the student needs to organize at one time.

✅ Supports the spatial organization of calculations by providing designated areas for operations with decimal numbers.

✅ Uses objective and well-spaced answer choices, reducing the need for extensive written responses.

✅ Includes a contextualized word problem in which the student determines how much remains from 2.5 L of water after 0.75 L has been used, accompanied by visual support featuring a bottle and a container.

✅ Develops understanding of the fraction division procedure by asking the student to recognize the correct transformation before moving on to more complex calculations.

✅ Provides both a standard version and an UPPERCASE version, expanding the possibilities for use according to the student’s reading profile.

✅ The answer key provides more than just the correct alternatives: for operations requiring greater organization, it also shows the steps and calculation work, making correction and teacher support easier.

✅ Saves approximately 3 hours and 45 minutes of teacher planning time.