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Is one third a good estimation for the decimal 0.3?
It depends upon for what you need the estimation. However, 0.3 is exactly 3/10 which is a much more useful estimate (if it could be called one) as dividing a non-repeating decimal number by 10 guarantees an exact answer in decimals whereas dividing by 3 (or multiplying by 1/3 which is the same) can lead to repeating decimals which can only be approximated as a terminating decimal.
What is 1389 divided by 73 in estimation?
19.0274
What is approximate estimation?
If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
How can you use estimation to determine whether you have placed the decimal point correctly in the product?
A reasonable estimate will give an indication of the order of magnitude of the number. The order of magnitude is determined by the decimal point and so knowing the order can help in placing it.
Why use estimation?
Estimation is a quick of working out roughly what the answer is
