Write an expression for the calculation double 5 and then multiply 3

Double 5 is 2×5
Multiply 3 is ×3

So we put them together to get the expression. Pay attention though, it says double 5 THEN multiply 3. The way we make sure that double 5 comes first is by surrounding it by parentheses. The final expression is...

(2×5) × 3

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