You are watching: How to estimate fraction sums and differences
Know the rule of round off a fraction to the nearest 1/2. According to these rules, the fraction will it is in rounded to 0, 1/2 or 1. A portion whose worth is less than 1/4 will be rounded down to 0, a fraction greater 보다 or same to 1/4 and less 보다 or same to 3/4 will certainly be rounded come 1/2 and a portion greater 보다 3/4 will certainly be rounded to up 1. Because that example, 4/16 rounds to 1/2, 3/16 rounds to 0 and also 13/16 rounds approximately 1.
Convert the fractions and also then include or subtract. If the math difficulty is 9/16 + 5/12, by round off the fractions to the nearest 1/2, your brand-new math difficulty becomes 1/2 + 1/2, which amounts to 1. The fraction 9/16 rounds to 1/2 since it is much less than 12/16 (3/4) and greater than 4/16 (1/4). The portion 5/12 ring to 1/2 because it is much less than 9/12 (3/4) however greater 보다 3/12 (1/4). As soon as subtracting the fractions, 1/2 (9/16) - 1/2 (5/12) = 0
Solve the full trouble to present how nearby you were to the precise answer. If the trouble was excellent without estimating, friend would transform 9/16 to 27/48 and also 5/12 come 20/48 so the the fractions have actually the same denominator. Then 27/48 + 20/48 = 47/48. The fraction 47/48, i m sorry is indistinguishable to 0.979, is close to 1. Subtraction is done the same way. 27/48 – 20/48 = 7/48 (0.145). The result is close come 0.
rest the number in the denominator (bottom number) up into fours. This will assist in calculating if the numerator (top number) is more or much less than a quarter, fifty percent and three quarters of the denominator.
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An estimate is an approximate calculation, so no everyone will certainly be close in comparison come the precise answer.
break the number in the denominator (bottom number) up right into fours. This will aid in calculating if the molecule (top number) is an ext or less than a quarter, fifty percent and 3 quarters that the denominator.
An estimate is an approximate calculation, so no everyone will be nearby in comparison come the precise answer.
Sharmaine Jones to be born and raised in new York and also began her very first professional writing project as a freelance blogger because that MTV in may of 2010. She work shows up on MTV's Latino website, MTV Tr3s. She to visit LaGuardia neighborhood College to study work therapy.