Estimate the sum and differences

86.9 - 18

1 answer

To estimate the difference \( 86.9 - 18 \), we can round the numbers to the nearest whole numbers:

  • Round \( 86.9 \) to \( 87 \).
  • Round \( 18 \) to \( 18 \) (it remains the same).

Now, we can perform the subtraction:

\[ 87 - 18 = 69 \]

So, the estimated difference is approximately \( 69 \).