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Introduction to Decimals
Introduction to Decimals — from OpenStax Prealgebra 2e.
Introduction to Decimals
Gasoline price changes all the time. They might go down for a period of time, but then they usually rise again. One thing that stays the same is that the price is not usually a whole number. Instead, it is shown using a decimal point to describe the cost in dollars and cents. We use decimal numbers all the time, especially when dealing with money. In this chapter, we will explore decimal numbers and how to perform operations using them.
Zvino iwe Hapana calculator inogadzirisa iyi imwe, asi mapepa ayo anogona kuongororwa. Tsananguro:
Mubhadharo wakasununguka unowedzera mazita ezvidzidzo, zvinyorwa zvezvidzidzo zvawakati wazvigadzirira, zvidzidzo zvawave uchizvigadzirisa, uye mudzidzisi waungabvunza nezvechidzidzo ichi. Maths inowanikwa kune vese, vasiri vadzidzi kana vadzidzi. Kuwana mazita ezvidzidzo zvinodiwa kunogona kuitwa pawebsite ye Maths.
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Tinya chero chiratidzo kuti uone chirevo chakazara, vhidhiyo, uye kuti chii chinoreva chero chiratidzo.
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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.
Zvimwe zvenyaya iyi zvakashandurwa kubva OpenStax Prealgebra 2e (CC BY-NC-SA 4.0). Condensed uye re-akaratidza pano; zvikanganiso ndedu. Nekuti chigadzirwa ichi chine mvumo yekushandiswa pasina kutengeswa, ichi chidzidzo chine mukana wekuwana mari, hachina kutengesa, uye chinopihwa pasi pechibvumirano ichi.