IGCSEMathsEdexcelMaths AFoundationFlashcards1. Numbers & the Number SystemPowers, Roots & Standard Form

Powers, Roots & Standard Form (Edexcel IGCSE Maths A: Foundation): Flashcards

Exam code: 4MA1

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What does a number written in standard form look like?
A number in standard form looks like $a \times 10^{n}$ , e.g. $5.2 \times 10^{3}$ .
It is a number between 1 and 10 multiplied by a power of ten.
When a number is written in standard form $a \times 10^{n}$ , which values can $a$ be?
For $a \times 10^{n}$ , $a$ is at least 1 and less than 10, $1 \leq a < 10$ .
This means there is one non-zero digit before the decimal point.
True or False?
When a number is written in standard form $a \times 10^{n}$ , $n$ can be a fraction.
False.
For a number written in standard form, $a \times 10^{n}$ , the value $n$ must be an integer.
It can be zero, positive or negative.
When a value between 0 and 1, is written in standard form $a \times 10^{n}$ , what type of number will $n$ be?
If a value is between 0 and 1 then when it is written in standard form, $n$ will be a negative integer.
E.g. 0.083 would be written as 8.3 x 10^-2.

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