# data[].attributes.headline
Multiplying any number by 1, results in the number itself

# data[].attributes.subject
Multiplying any number by 1, results in the number itself

# data[].attributes.headline
all operations have an inverse (addition and subtraction, multiplication and division...)

# data[].attributes.subject
all operations have an inverse (addition and subtraction, multiplication and division...)

# data[].attributes.headline
reasoning between rational and irrational numbers

# data[].attributes.subject
reasoning between rational and irrational numbers

# data[].attributes.headline
The sum of two positive integers will be a positive integer.

# data[].attributes.subject
The sum of two positive integers will be a positive integer.

# data[].attributes.headline
Rational numbers combine to make more rational numbers.

# data[].attributes.subject
Rational numbers combine to make more rational numbers.

# data[].attributes.headline
Logical explanation from one problem to the next

# data[].attributes.subject
Logical explanation from one problem to the next

# data[].attributes.body
a+b=b+a, a x b = b x a

# data[].attributes.headline
putting two numbers together, with addition or multiplication, and knowing how to reverse that process with subtraction and division

# data[].attributes.subject
putting two numbers together, with addition or multiplication, and knowing how to reverse that process with subtraction and division