Variables and expressions
Identify and use symbols as variables in expressions, and evaluate simple expressions by substitution. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
Evaluate the expression when m = 25.
m - 1
Answer: 24
See one solved, step by step
Evaluate the expression when k = 3.
9 · k
📘 Worked solution
19 · k = 9 · 3Replace k with 3.
2= 27Multiply to finish.
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