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# ProFuturo Resources > Exercise

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### CK-12 Biology Workboo? At grade

The CK-12 Biology Workbook complements the CK-12 Biology FlexBook® textbook and includes six worksheets per lesson. Each worksheet contains one of the following types of questions: multiple choice, T/ ...

### CK-12 Earth Science For High School Workboo? At grade

The CK-12 HS Earth Science Workbook complements the CK-12 HS Earth Science FlexBook® resource and includes six worksheets per lesson. Worksheets contain one of the following: multiple choice, T/F, voc ...

### CK-12 Earth Science For Middle School Workboo? At grade

The CK-12 Earth Science for Middle School Workbook complements the CK-12 Earth Science for Middle School FlexBook® resource and includes six worksheets per lesson. Worksheets contain one of the follow ...

### CK-12 Physical Science For Middle School Workboo? At grade

The CK-12 Physical Science for Middle School Workbook complements the CK-12 Physical Science for Middle School FlexBook® resource and includes six worksheets per lesson. Worksheets contain one of the ...

### Sum and subtraction of fractions

The sum of two fractions with equal denominators is a new fraction with the same denominator and the numerator with the sum of the numerators. To subtract fractions we proceed in the same way: keep th ...

### Definition and basic elements of a circumference

You'll learn the basic notions about the circumference.

At the end of the theorical explanation, you can practice or create 5 exercises to master this subject.

Definition and basic elements of a cir ...

### The set of the natural numbers, order and representation

You'll learn how to identify the set of natural numbers.

At the end of the theorical explanation, you can practice or create 5 exercises to master this subject.

The set of the natural numbers, order ...

### Definition and notation of sets

You'll learn the basic definitions of set theory to work after the Algebra of sets.

At the end of the theorical explanation, you can practice or create 5 exercises to master this subject.

Definition ...

### General method for the calculation of determinants

You'll learn to calculate determinants of any order, some of its most important propierties and how to calculate a adjoint matrix.

General method for the calculation of determinants is a didactic c ...

### Matrix concept and types of matrices

You'll learn what is a matrix , its elements and the way to add up and to multiply matrices.

Matrix concept and types of matrices is a didactic content from Sangakoo. In this space you will find te ...