3/8 is closest to 1/2 and 11/16 is less than 3/4 so it is also closest to 1/2. This works well through a calculator such as if you are adding 3/8 + 11/16. In this case however, a better estimate might be achieved by a human.įor example, the standard practice for estimating sums and differences of fractions for grammar school students seems to be rounding to the closest 1/2 by rounding to 0, 1/2 or 1. A calculator can certainly make an estimate based on defined parameters in a formula and there are many applications where estimating is done very well with calculators (or computers).
Value of Estimating Fractionsįirst, always follow the guidelines your teacher gives you for estimating sums and differences of fractions.Įstimating operations on proper fractions in this way is sometimes more accurately done by a human than a calculator. Fractions ≥ 15/16 are rounded up to 16/16=8/8=1įractions table for halves, quarters, eighths and sixteenths with decimal equivalentsįractions table.Fractions ≥ 7/8 are rounded up to 8/8=1Įstimating sums and differences of fractions to the nearest 1/8.Fractions ≥ 5/8 and Fractions ≥ 1/8 and See the section on " Value of Estimating Fractions" below.Įstimating sums and differences of fractions to the nearest 1/2Įstimating sums and differences of fractions to the nearest 1/4 For more precise estimating we added the ability to round fractions to the closest 1/4 or 1/8. This online calculator was originally set up to estimate by rounding fractions to the nearest 1/2. Use rounding to estimate answers when adding or subtracting proper fractions. Six of the children are girls.Estimate sums and differences for positive proper fractions, n/d (numerator/denominator), where n ≤ d and 0 ≤ n/d ≤ 1. In the simplest form, what fraction of students eat lunch in the cafeteria? Six students bring their lunch to school. There are 18 students in Jacob's homeroom. What fraction of the 26 alphabets did he use? Express your answer as a fraction in the simplest form He used only 8 alphabets to solve the puzzle. In a letter puzzle game, John can use every alphabet only once. The following fraction is reduced to its lowest terms except one. Milka's grandmother planted 12 rows of vegetables.
What is 3/15 expressed in its lowest term? We can write the expression 4/12 in its lowest term as 1/3. Write a fraction of what part of Zdeněk's water he picked. Zdeněk picked up 15 l of water from a 100-liter full-water barrel. Reduce the fraction 16/24 to the lowest terms.Ĭalculate the value of the expression z/3 - 2 z/9 + 1/6, for z = 2 What fraction of the animals are chickens? Express your answer as a fraction in the simplest form. What fraction of the class represents the boys?Ī farm has 20 animals. In a class, there are 15 girls and 30 boys. If there are seven apples and five oranges in the basket, what fraction of oranges are in the fruit basket? What fraction of Max's socks are either brown or black? From this, six pairs are blue, three pairs are brown, two are black, and two are white.
and they are automatically converted to fractions - i.e. An example of a negative mixed fraction: -5 1/2.īecause slash is both sign for fraction line and division, use a colon (:) as the operator of division fractions i.e., 1/2 : 1/3.ĭecimals (decimal numbers) enter with a decimal point. Mixed numerals (mixed numbers or fractions) keep one space between the integer andįraction and use a forward slash to input fractions i.e., 1 2/3. If you use mixed numbers, leave a space between the whole and fraction parts. Rules for expressions with fractions: Fractions - use a forward slash to divide the numerator by the denominator, i.e., for five-hundredths, enter 5/100.
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