Free OLNA Numeracy Questions and Answers

Question 1

A nanosecond is one billionth of a second.
Which of the following is a nanosecond?

Accepted Answer

1/1 000 000 000

Answer

Explanation:
One billion is one thousand million or 1 000 000 000.
So, therefore, one billionth is one over a billion.

Question 2

A map has a scale of 1 centimetre representing a distance of 2 kilometres in real life.
What is the appropriate scale for the map?

Accepted Answer

1:200 000

Answer

Explanation:
1 cm:2 km means 1 cm:200 000 cm as there are 100,000 centimetres in a kilometre.

Question 3

Baby John weighed 3100 grams at birth. It is estimated that in the next 12 months, his weight will increase threefold.

What will John’s estimated weight be in 12 months?

Accepted Answer

9.3 kilograms

Answer

Explanation:
Times means multiply. Therefore 3100 x 3 = 9300 grams.
9300 is not one of the choices, so we need to change 9300 grams to kilograms.
The fact that 1000 grams = 1 kilogram, means 9300 grams = 9.3 kilograms.

Question 4

Joseph wants to buy a pair of runners. He visits five stores and notes the prices on offer for the same style of shoe.
The prices are listed as: $59, $58, $58, $64 and $66.

What is the mean (average) price of the shoes?

Accepted Answer

$61

Answer

Explanation:
The mean is found by adding all scores and dividing by the number of scores.
The five scores add to 305. Hence the mean is 61 ($305 ÷ 5 = $61).

Question 5

In a jar of 20 marbles, there are orange, purple, and red marbles. A marble is chosen at random from the jar. Eli wants either an orange or a purple marble.

What is the probability of Eli getting what he wants?

Accepted Answer

3/5

Answer

Explanation:
The probability of an event happening is: What you want divided by the total number of outcomes.
In the jar, there are eight red, three orange, and nine purple marbles. The total number of marbles is 20.
Eli wants an orange or purple marble, of which there are 12.

OLNA - Online Literacy and Numeracy Assessment Practice Test

OLNA - Online Literacy and Numeracy Assessment Practice Test

Free OLNA Numeracy Questions and Answers