What does the Ans button on your calculator do?

The Ans button recalls the last answer the calculator calculated. If you have used your calculator to work out a long calculation and then want to square the answer, you can just type Ans 2 .

True or False? You should round your answer each time you use your calculator to do a series of calculations in your working.

False. You should only round your answer at the very end of your working, otherwise you may get rounding errors. You can show you are not rounding by putting three dots at the end of a number. For example: sin(20)=0.3420... then 15×0.3420... means you typed in 15×Ans.

IGCSEMathsEdexcelMaths AHigherFlashcardsNumbers & the Number SystemUsing a Calculator

Using a Calculator (Edexcel IGCSE Maths A)

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FrontUsing a Calculator
True of False?
To find the square of -13, you would type $- 13^{2}$ into your calculator.

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True of False?
To find the square of -13, you would type $- 13^{2}$ into your calculator.
False.
To find the square of -13, you would type ${(- 13)}^{2}$ into your calculator.
Your calculator applies the order of operations so it will square before multiplying by -1 unless you use brackets.
True or False?
Typing $\frac{2 + 5}{3 - 1}$ into a calculator is the same as $2 + 5 \div 3 - 1$ .
False.
Typing $\frac{2 + 5}{3 - 1}$ into a calculator is not the same as $2 + 5 \div 3 - 1$ .
Imagine invisible brackets around the numerator and denominator, giving $(2 + 5) \div (3 - 1)$ .
How do you use a calculator to find the cube root of a number?
To find the cube root of a number on a calculator, find the button that looks like $\sqrt[3]{}$ .
Be careful, this is different to typing 3 followed by the square root button, $3 \sqrt{}$ .
What does the Ans button on your calculator do?
The Ans button recalls the last answer the calculator calculated.
If you have used your calculator to work out a long calculation and then want to square the answer, you can just type Ans².
True or False?
You should round your answer each time you use your calculator to do a series of calculations in your working.
False.
You should only round your answer at the very end of your working, otherwise you may get rounding errors.
You can show you are not rounding by putting three dots at the end of a number.
For example:
sin(20)=0.3420... then 15×0.3420... means you typed in 15×Ans.
If your calculator has given you an exact answer (e.g. $2 π, \sqrt{3}, \frac{2}{7}$ ), how do you change it to a decimal?
To change an exact answer into a decimal, press the $S \Leftrightarrow D$ button.
On some calculators, this might be labelled differently such as $F \Leftrightarrow D$ .

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