Factors, Powers And Standard Form Worksheet Page 20
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21B
4
A water molecule has a mass of 3 3 10
kg.
226
A glass of water contains 1.2 3 10
25
molecules of water.
Work out the mass of the water in the glass. Give your answer in grams.
5
An adult brain has a mass of 1.4 3 10
3
grams.
It contains 7 3 10
10
brain neurons.
2
AO
Work out the average mass of a neuron. Give your answer in grams in standard form.
Review exercise
E
1
Write down the numbers from the cloud which are
a
multiples of 3
[2 marks]
25
19
b
prime numbers
20
[2 marks]
17
c
factors of 100.
18
[2 marks]
22
23
24
21
2
Write down
a
all the factors of 48
[2 marks]
b
all the prime factors of 48.
[1 mark]
3
Write down a multiplication fact to show that 51 is not a prime number.
[1 mark]
4
Write down the value of
a
5
3
[1 mark]
____
b
√
144
[1 mark]
___
3
c
64
√
[1 mark]
________
C
5
√
Work out the value of
10
2
2 6
2
.
[2 marks]
6
Write 3300 as a product of prime factors using index notation.
[3 marks]
7
Work out
a
the HCF of 80 and 96
[3 marks]
b
the LCM of 45 and 54.
[3 marks]
8
Write each of these expressions as a single power.
a
4
4
3 4
2
[1 mark]
b
3
8
3 3 3 3
5
[1 mark]
c
6
12
4 6
5
[1 mark]
C
9
Daisy is tiling her bathroom floor.
260 cm
180 cm
2
She wants to use identical square tiles to completely cover the floor with no overlap.
AO
Work out the largest size of square tile Daisy can use.
[3 marks]
Chapter 10 Review exercise
177
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