Accuracy of final answers | Maths | Quizalize & Oak National Academy

Starter quiz

Which of these numbers is not a whole number?

12

16

7

2.3 ✓
Press the $\pi$ button on your calculator. What is the sixth digit?

9 ✓

6

5

2
Enter $\sqrt{5}$ on your calculator. What is the second digit?

'2' ✓
A circle has a diameter of 3 cm. What is the circumference of the circle to 1 decimal place?

'9.4' ✓
Enter $\sqrt[3]{64}$ on your calculator. What is the answer?

'4' ✓
Which of these is an example of a recurring decimal?

1.2

1.252525253

$1.\dot{6}$ ✓

2.222

True or false? The group of integers includes negative numbers.

True ✓

False
A ______ number is one that can be written in the form $a \over b$ where $a$ and $b$ are both integers and $b \ne 0$ .

'rational' ✓
Identify the rational number.

$\pi$

0.263 ✓

$\sqrt 3$

$\sqrt 2$
Which of these is a surd?

$\sqrt {21}$ ✓

$\sqrt {25}$

$\sqrt {36}$

$\sqrt {49}$
Which of these is a surd?

$\sqrt[3] {64}$

$\sqrt[3] {27}$

$\sqrt[3] {16}$ ✓

$\sqrt[3] 8$
Which of these is a surd?

$\sqrt {1 \over 25}$

$\sqrt {0.25}$

$\sqrt {1 \over 6}$ ✓

$\sqrt {1 \over 49}$

Loading worksheet ...

Loading presentation ...

There is always a choice regarding how you represent a value.
You need to consider the most suitable way for the situation.
Rounding reduces accuracy so a rounded answer is not always useful.
There are agreed forms: one operation remaining and the result of the operation would produce a non-terminating decimal.
Surd form is one such acceptable way.

Surds are any number with a root symbol.

√4 is not a surd as it is equivalent to 2.

Recurring decimal - A recurring decimal is one that has a digit or sequence of digits that repeat endlessly.
Terminating decimal - A terminating decimal is one that has a finite number of digits after the decimal point.
Rational number - A rational number is one that can be written in the form a/b where a and b are integers and b is not equal to 0.
Irrational number - An irrational number is one that cannot be written in the form a/b where a and b are integers and b is not equal to 0.