Use estimate to identify them. Show how you estimated the answers.

Question

D) 11×603-3×240=519

Answer 1

To estimate the expression \( 11 \times 603 - 3 \times 240 \) and compare it to \( 519 \), we can round the numbers to make the calculations simpler.

1. Estimate \( 11 \times 603 \):

   • Round \( 603 \) to \( 600 \).
   • So, \( 11 \times 603 \) can be estimated as \( 11 \times 600 \).
   • Calculating this, \( 11 \times 600 = 6600 \).

2. Estimate \( 3 \times 240 \):

   • Round \( 240 \) to \( 240 \) (no rounding needed, but we can keep it as is).
   • So, \( 3 \times 240 \) is \( 720 \).

3. Combine the estimates:

   • Now plug the estimates back into the expression: \[ 6600 - 720 = 5880. \]

4. Compare with \( 519 \):

   • Our estimated result of \( 5880 \) is significantly larger than \( 519 \).

Conclusion:

The left side of the equation \( 11 \times 603 - 3 \times 240 \) estimates to approximately \( 5880 \), which is much greater than \( 519 \). Thus, the statement \( 11 \times 603 - 3 \times 240 = 519 \) is not true.