Question

Sorry if it's a bother, but what's the answer to these? I'm having a little bit of trouble.

Answer 1

Solution (a):

~Let's change 9.9² to 10² since we have to estimate.~

We know that:

• 10² = 100
• Given expression: 9.9² × 1.79

Solving the expression:

• 9.9² × 1.79
• => 10² × 1.79
• => 100 × 1.79
• => 179

The estimated value of 9.9² × 1.79 is 179.

Solution (b):

~Let's change √97.5 to √100 and 1.96 to 2 since we have to estimate.~

We know that:

• √100 = 10
• Given expression: √97.5 ÷ 1.96

Solving the expression:

• √97.5 ÷ 1.96
• => √100 ÷ 2
• => 10 ÷ 2
• => 5

The estimated value of √97.5 ÷ 1.96 is 5.