. Add one pair of parentheses or square
brackets to the left side of each equation to
make a true statement.
a) 3.5 × 4.1 - 3.5 - 2.8 = -0.7
b) 2.5 + (-4.1) + (-2.3) × (-1.1) = 4.29
c) -5.5 - (-6.5) ÷ 2.4 + (-1.1) = -0.5

Let's solve the equations step by step by strategically placing parentheses or square brackets to make each statement true.

### a) \( 3.5 \times 4.1 - 3.5 - 2.8 = -0.7 \)

Without parentheses:
\[
3.5 \times 4.1 - 3.5 - 2.8 = 14.35 - 3.5 - 2.8 = 8.05
\]
To get \(-0.7\), we need to modify the operation order:
By adding parentheses around \( 3.5 \times (4.1 - 1) \):
\[
3.5 \times (4.1 - 1) - 2.8 = 3.5 \times 3.1 - 2.8 = 10.85 - 2.8 = 8.05
\]

This approach doesn’t work. 
Let's place the parentheses

Add one pair of parentheses or square brackets to the left side of each equation to make a true statement.
a) 3.5 × 4.1 - 3.5 - 2.8 = -0.7
b) 2.5 + (-4.1) + (-2.3) × (-1.1) = 4.29
c) -5.5 - (-6.5) ÷ 2.4 + (-1.1) = -0.5

Learn how to solve equations by strategically adding parentheses to correct the order of operations. This problem includes simple arithmetic expressions and focuses on the proper placement of parentheses for true statements. Suitable for students in Grades 6-8.

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