Estimating numbers using the general rule is actually rounding off to the nearest 10,100 or 1000.


Eg: Estimate the product of 2678 and 3241 using general rule
ANS: 2678 can be rounded off to the nearest 1000 = 3 thousand
3241 can be rounded off to the nearest 1000 =3 thousand

Now all you have to do is multiply 3 thousand×3 thousand=90Lakh
and now you can multiply 2678×3241=86,79,398
so it is just rounded off

Estimating Products:
Estimating products involves making an educated guess or approximation of the final answer by utilizing rounding and simplification techniques. This can be helpful when you need a quick answer or when dealing with large numbers that are difficult to multiply mentally.

General Rule:
To estimate a product, you can round each number to the nearest tens, hundreds, or thousands place and then multiply the rounded numbers together. This will give you a rough estimate of the actual product.

Example:
Let's say you want to estimate the product of 47 and 63.
1. Round 47 to the nearest tens, which is 50.
2. Round 63 to the nearest tens, which is 60.
3. Multiply the rounded numbers: 50 x 60 = 300.
So, the estimated product of 47 and 63 is 300.

Explanation:
Estimating products can be useful in situations where you need a quick answer or when you want to check if your calculated answer is reasonable. It can also be helpful for mental math calculations or when working with large numbers that are challenging to multiply by hand.
By following the general rule of rounding each number to a convenient place value, you can simplify the multiplication process and come up with a close approximation of the actual product. This method can save time and make solving math problems more manageable.