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Maths Quiz - Decimal Numbers 3 (Difficult) (Questions)

Welcome to the third quiz in our Difficult series of Eleven Plus maths quizzes on Decimal Numbers. Now, you will know that metric measures (like tonnes, kilograms, metres and centimetres for example) are all based on decimal numbers. In this quiz we will test your ability to convert one to another by multiplying or dividing by 10, 100, 1,000, 10,000 or even 1,000,000.

Here’s a little reminder which should help you in the quiz:

1 tonne = 1,000 kg
1 kg = 1,000 grams
1 kilometre = 1,000 metres
1 m = 100 cm
1 cm = 10 millimetres

Armed with this information, you shouldn’t find the questions too difficult. Just take your time and read each on thoroughly before you choose your answer. Good luck!

What was 10.7856 multiplied by if the answer is 107,856?

[ ]	Ten-thousand
[ ]	One-thousand
[ ]	One hundred-thousand
[ ]	One hundred

How many grams are there in 2.397 tonnes?

[ ]	239,700 g
[ ]	2,397,000 g
[ ]	23,970 g
[ ]	2,397 g

What is 103.274 metres in millimetres?

[ ]	10,327.4 mm
[ ]	1,032.74 mm
[ ]	103,274 mm
[ ]	1,032,740 mm

What is 235 millimetres in metres?

[ ]	0.0235 m
[ ]	23.5 m
[ ]	2.35 m
[ ]	0.235 m

A certain object weighs 9.374,808 tonnes. What is this in kilograms?

[ ]	9,374.808 kg
[ ]	93,748.08 kg
[ ]	937.4808 kg
[ ]	937,480.8 kg

How many cubic centimetres are there in 2.8 cubic metres?

[ ]	28,000 cm³
[ ]	2,800,000 cm³
[ ]	280,000 cm³
[ ]	2,800 cm³

The Eiffel Tower is 0.324 km tall. How high is it in centimetres?

[ ]	3,240,000 cm
[ ]	324,000 cm
[ ]	32,400 cm
[ ]	3,240 cm

How many grams are there in 26.872 kilograms?

[ ]	26.872 g
[ ]	2,687.2 g
[ ]	268.72 g
[ ]	26,872 g

What was 0.00001 multiplied by if the answer is 10?

[ ]	One thousand
[ ]	Ten-thousand
[ ]	One hundred-thousand
[ ]	One million

10.

What was 12,573 divided by if the answer is 0.12573?

[ ]	One thousand
[ ]	Ten-thousand
[ ]	One hundred-thousand
[ ]	One million

Maths Quiz - Decimal Numbers 3 (Difficult) (Answers)

What was 10.7856 multiplied by if the answer is 107,856?

[x]	Ten-thousand
[ ]	One-thousand
[ ]	One hundred-thousand
[ ]	One hundred

The rule for multiplying by a whole number beginning with 1 and followed by one or more zeros, e.g. multiplying by 10, 100, 1,000, ... is as follows: When multiplying by such a number, move the digits to the left by the same number of zeros as in the number: 10,000 × 10.7856 = 107,856: the digits have moved four places to the left = the number of zeros in ten-thousand

How many grams are there in 2.397 tonnes?

[ ]	239,700 g
[x]	2,397,000 g
[ ]	23,970 g
[ ]	2,397 g

There are 1,000 g in 1 kg, and 1,000 kg in 1 tonne. 2.397 x 1,000 x 1,000 = 2,397,000

What is 103.274 metres in millimetres?

[ ]	10,327.4 mm
[ ]	1,032.74 mm
[x]	103,274 mm
[ ]	1,032,740 mm

There are 1,000 mm in 1 m, so in 103.274 m there are 1,000 × 103.274 = 103,274 mm

What is 235 millimetres in metres?

[ ]	0.0235 m
[ ]	23.5 m
[ ]	2.35 m
[x]	0.235 m

There are 1,000 mm in 1 m, so 235 mm ÷ 1,000 = 0.235 m

A certain object weighs 9.374,808 tonnes. What is this in kilograms?

[x]	9,374.808 kg
[ ]	93,748.08 kg
[ ]	937.4808 kg
[ ]	937,480.8 kg

There are 1,000 kg in 1 tonne, so in 9.374,808 tonnes there are 9.374,808 x 1,000 = 9,374.808 kg

How many cubic centimetres are there in 2.8 cubic metres?

[ ]	28,000 cm³
[x]	2,800,000 cm³
[ ]	280,000 cm³
[ ]	2,800 cm³

There are 100 cm in 1 m, so in 1 cubic m there are 100 × 100 x 100 = 1,000,000 cubic cm. In 2.8 cubic m there are 2.8 × 1,000,000 = 2,800,000 cm³

The Eiffel Tower is 0.324 km tall. How high is it in centimetres?

[ ]	3,240,000 cm
[ ]	324,000 cm
[x]	32,400 cm
[ ]	3,240 cm

There are 1,000 m in 1 km, so in 0.324 km there are 0.324 × 1,000 = 324 m.
Next, there are 100 cm in 1 m, so in 324 m there are 324 x 100 = 32,400 cm

How many grams are there in 26.872 kilograms?

[ ]	26.872 g
[ ]	2,687.2 g
[ ]	268.72 g
[x]	26,872 g

There are 1,000 g in 1 kg, so in 26.872 kg there are 1,000 × 26.872 = 26,872 g

What was 0.00001 multiplied by if the answer is 10?

[ ]	One thousand
[ ]	Ten-thousand
[ ]	One hundred-thousand
[x]	One million

For 0.00001 to become 10, the digits will have to move 6 places to the left. You will have to multiply 0.00001 by 1,000,000 - which has 6 zeros

10.

What was 12,573 divided by if the answer is 0.12573?

[ ]	One thousand
[ ]	Ten-thousand
[x]	One hundred-thousand
[ ]	One million

The rule for dividing by a whole number beginning with 1 and followed by one or more zeros, e.g. dividing by 10, 100, 1,000, ... is as follows: When dividing by such a number, move the digits to the right by the same number of zeros as in the number: 12,573 ÷ 100,000 = 0.12573: the digits have moved five places to the right = the number of zeros in one hundred-thousand