precision
Use estimation when an approximate answer is acceptable.
4 x 0.8 = 3.2
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
To check a subtraction problem, you can add the result of the subtraction to the smaller number. If the sum equals the larger number, the subtraction is correct. Alternatively, you can use estimation by rounding the numbers to see if the difference falls within a reasonable range. Double-checking the numbers involved also helps ensure accuracy.
precision * * * * * For reasonableness you only use estimation.
estimation
With a rough estimation.
you can use it to check an answer
a reasonable estimation is 3.75 x 10-3 m3
To check your multiplication, you can use the inverse operation: division. Divide the product by one of the original factors; if the result equals the other factor, your multiplication is correct. Another method is to break down the multiplication into smaller parts using the distributive property and then add the results. Additionally, you can use estimation to see if the product is reasonable.
Use estimation when an approximate answer is acceptable.
to use your head and explain what you solved
4 x 0.8 = 3.2
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
To check a subtraction problem, you can add the result of the subtraction to the smaller number. If the sum equals the larger number, the subtraction is correct. Alternatively, you can use estimation by rounding the numbers to see if the difference falls within a reasonable range. Double-checking the numbers involved also helps ensure accuracy.