Compatible Numbers
It is easier to simply add two one-digit numbers than to mess about with estimation!
Front end estimation involves rounding the numbers in a calculation to make it easier to estimate the total quickly. To perform front end estimation, identify the leading digits of each number, round them to the nearest whole number or significant figure, and then perform the arithmetic operation (addition or subtraction) with these rounded values. For instance, if estimating 47 + 32, round to 50 + 30, resulting in an estimated sum of 80. This method provides a quick approximation rather than an exact answer.
To estimate the difference between 670 and 24, you can round 24 to 20 for easier calculation. Subtracting 20 from 670 gives you approximately 650. Therefore, a number line that highlights the point around 650 would best represent the estimation for the difference between 670 and 24.
19
To estimate 9.72, you can round the number to the nearest whole number, which would be 10. Another method is to round to the nearest tenth, which would be 9.7. You can also use compatible numbers, such as rounding 9.72 to 10 for easier mental calculations. These estimation techniques help simplify complex numbers for quick approximations.
compatible numbers
Compatible Numbers
15 ,67, and 84 are numbers that are close to the given numbers to make estimation easier.
It is easier to simply add two one-digit numbers than to mess about with estimation!
19
To estimate 467.6 multiplied by 8, you can round each number to make the calculation easier. Rounding 467.6 to 470 and 8 to 10, you can multiply these rounded numbers (470 x 10) to get an estimated product of 4700. This estimation provides a quick approximation of the actual product without the need for precise calculations.
6 * 5 * 4 * 3 I'm sure you can calculate the answer from here. (that assumes you can't use an already used number again, if reuse is allowed the calculation is even easier)
To estimate 9.72, you can round the number to the nearest whole number, which would be 10. Another method is to round to the nearest tenth, which would be 9.7. You can also use compatible numbers, such as rounding 9.72 to 10 for easier mental calculations. These estimation techniques help simplify complex numbers for quick approximations.
Estimating 26 plus 78 as 25 plus 75 is a form of rounding that simplifies the calculation while maintaining the overall magnitude of the numbers involved. By rounding down to 25 and 75, you are working with numbers that are easier to mentally add together quickly. This estimation technique is particularly useful when you need a rough answer or when exact precision is not necessary.
They're simply used for clarity - to make the number easier to read.
The answer depends on your familiarity with number bonds.
Not in the sense that you can type the word of a number and/or operation to do a calculation, like having: =Five multiplied by seven =Ten + four =8 minus 2 However some text functions can be used to generate numbers, like finding the length of a piece of text and using that number in a calculation. You can also give cells actual names and then use those names in calculations, which can be easier than remembering cell addresses. So you could have a cell named Total and then do a calculation like this, using the word Total instead of the actual cell reference: =Total * 10%