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Introduction to Fractions
Introduction to Fractions — from OpenStax Prealgebra 2e.
Introduction to Fractions
Often in life, whole amounts are not exactly what we need. A baker must use a little more than a cup of milk or part of a teaspoon of sugar. Similarly a carpenter might need less than a foot of wood and a painter might use part of a gallon of paint. In this chapter, we will learn about numbers that describe parts of a whole. These numbers, called fractions, are very useful both in algebra and in everyday life. You will discover that you are already familiar with many examples of fractions!
Núna ūú Engin reiknivél leysir þetta, en hlutar þess eru reiknanlegir. Prófaðu einn hér fyrir neðan, eða sláðu inn þinn eigin.
Ókeypis reikningur bætir við athugasemdum við hverja kennslustund, skrá yfir það sem þú hefur lokið, leyst vandamál á einum stað og kennari sem þú getur spurt um þessa síðu.Stærðfræðin sjálf er opin öllum, skráður inn eða ekki.
Skráðu þig inn InnskráningTákn notuð hér
Pikkaðu á hvaða tákn sem er fyrir fulla skilgreiningu, mynd og hvað hvert bréf í því merkir.
Spurningar sem fólk spyr
Why does the order of operations matter?
Because 2 + 3 × 4 would otherwise be two different numbers. The convention (brackets, exponents, multiplication and division, addition and subtraction) exists so every reader gets the same value from the same expression.
How do I check an arithmetic answer?
Estimate first (round every number and compute roughly), then compare. If the estimate and the exact answer disagree by more than a little, one of them is wrong. The solver shows every operation, so you can find which line went astray.
Why are fractions harder than decimals?
They are not harder, they are more exact: 1/3 is a precise number, 0.333 is an approximation. Fractions need a common denominator to add, which is the one extra step people trip on.
Hlutar þessarar síðu eru aðlagað frá OpenStax Prealgebra 2e (CC BY-NC-SA 4.0). Þjappað og endurútskýrt hér; villur eru okkar. Vegna þess að upprunalega efni er leyfilegt til notkunar án viðskiptalegrar hagsmuna er þetta námskeið ókeypis, selur ekkert og er deilt undir sama leyfi.