Grade 8 Math · Algebra

Simplify and evaluate algebraic expressions

Add and subtract monomials and binomials of degree 1 with integer coefficients, and evaluate algebraic expressions that involve rational numbers. Unlimited questions, five difficulty levels, and a full worked solution every time — free.

Practice this skill Curriculum: G8-C2.1, G8-C2.2

Try one

Simplify by collecting like terms.

15n + 16 + n

Answer: 16n + 16

See one solved, step by step

Evaluate the expression when k = 1/2. Give your answer as a fraction (or whole number) in lowest terms.

6k + 4
📘 Worked solution
16k + 4 = 6 · 12 + 4Replace k with 1/2.
2= 3 + 4Multiply 6 by the fraction 1/2 first.
3= 142 = 7Rewrite 4 as 8/2 so you can add the two fractions, then simplify to lowest terms.

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