Use estimation when an approximate answer is acceptable.
4 x 0.8 = 3.2
Close to what it should be
Estimation is a quick of working out roughly what the answer is
Estimate 3.99 as 4. The answer will be one less than 4 + 0.84
precision * * * * * For reasonableness you only use estimation.
estimation
With a rough estimation.
you can use it to check an answer
Use estimation when an approximate answer is acceptable.
a reasonable estimation is 3.75 x 10-3 m3
4 x 0.8 = 3.2
to use your head and explain what you solved
Close to what it should be
Estimation is a quick of working out roughly what the answer is
Estimate 3.99 as 4. The answer will be one less than 4 + 0.84
It could be called estimation.