Here is the standard on which your child is working in math.
6th grade math is covering standards:
1. Write and evaluate numerical expressions involving whole-number
2. Write, read, and evaluate expressions in which letters stand for numbers.
a. Write expressions that record operations with numbers and with letters
standing for numbers. For example, express the calculation “Subtract y
from 5” as 5 – y.
b. Identify parts of an expression using mathematical terms (sum, term,
product, factor, quotient, coefficient); view one or more parts of an
expression as a single entity. For example, describe the expression 2 (8
+ 7) as a product of two factors; view (8 + 7) as both a single entity and a
sum of two terms.
c. Evaluate expressions at specific values of their variables. Include
expressions that arise from formulas used in real-world problems.
Perform arithmetic operations, including those involving whole-number
exponents, in the conventional order when there are no parentheses to
specify a particular order (Order of Operations). For example, use the
formulas V = s3 and A = 6 s2 to find the volume and surface area of a cube
with sides of length s = ½.
3. Apply the properties of operations to generate equivalent expressions.
For example, apply the distributive property to the expression 3 (2 + x) to
produce the equivalent expression 6 + 3x; apply the distributive property
to the expression 24x + 18y to produce the equivalent expression 6 (4x +
3y); apply properties of operations to y + y + y to produce the equivalent
4. Identify when two expressions are equivalent (i.e., when the two
expressions name the same number regardless of which value is
substituted into them). For example, the expressions y + y + y and 3y are
equivalent because they name the same number regardless of which
number y stands for.
Reason about and solve one-variable equations and inequalities.
5. Understand solving an equation or inequality as a process of answering a
question: which values from a specified set, if any, make the equation or
inequality true? Use substitution to determine whether a given number in a
specified set makes an equation or inequality true.
6. Use variables to represent numbers and write expressions when solving
a real-world or mathematical problem; understand that a variable can
represent an unknown number, or, depending on the purpose at hand, any
number in a specified set.
7. Solve real-world and mathematical problems by writing and solving
equations of the form x + p = q and px = q for cases in which p, q and x are
all nonnegative rational numbers.