Mathematics - 0580 CIE

Estimation

Gbogbo ọrọ náà

An estimate is a quick, sensible answer that tells you roughly what to expect, and it is one of the most practical skills in mathematics. It lets you check a calculator answer in seconds and catch the kind of mistake that turns 4.2 into 42.

In this lesson you will round numbers to a given number of decimal places or significant figures, make estimates by rounding to one significant figure, and round final answers to a sensible accuracy for the problem. Estimation is the habit that keeps your answers believable.

Ebumnobi

Round values to a specified degree of accuracy.
Make estimates for calculations involving numbers, quantities and measurements.
Round answers to a reasonable degree of accuracy in the context of a given problem.

Nkuzi Olu

Gee ntị na nkuzi a na ngwa

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Kaadị ncheta

Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.

Mee omume kaadị ndị a na ngwa

Akwụkwọ Ọmụmụ

Examiners reward answers given to a suitable accuracy, and a quick estimate is the fastest way to spot an answer that is wildly wrong. Rounding well is also how real measurements and money values are reported.

Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge

Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.

Akwụkwọ ndụmọdụ zuru oke nwere eserese

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Estimation. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Round 3.14159 to 2 decimal places. A. 3.1 B. 3.14 C. 3.142 D. 3.15 Answer: B
Round 0.04736 to 2 significant figures. A. 0.04 B. 0.047 C. 0.05 D. 0.0474 Answer: B
Estimate 38.2 x 5.9 ÷ 2.1 by rounding each number to 1 significant figure. A. 12 B. 60 C. 120 D. 1200 Answer: C
How many significant figures does 0.0205 have? A. 2 B. 3 C. 4 D. 5 Answer: B
Round 4827 to 2 significant figures. A. 48 B. 4800 C. 4830 D. 5000 Answer: B

Rue ajuju ndi a n'ime ngwa ahu