Factors Flashcards
What is a factor?
Numbers that multiply together to give a number
What are the factors of 15?
1 , 15
3 , 5
What are the factors of 24?
1 , 24
2 , 12
3 , 8
6 , 4
What is the highest common factor of 10 and 15?
5
What is the lowest common multiple of 5 and 3?
15
What is a prime number?
A number with exactly two factors
Is 1 a prime number? Why?
The number 1 is not a prime number because it only has one factor
What are the prime numbers?
2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41 , 43 , 47 , 53 , 59 , 61 , 71 , 73 , 79 , 83 , 89 , 97
What is 100 as a product of its prime factors?
100 = 2 x 2 x 5 x 5
What is 120 as a product of its prime factors?
120 = 2 x 2 x 2 x 3 x 5
How do you find the LCM in a Venn diagram?
Numbers in all the circle multiplied together
How do you find the HCF in a Venn diagram?
Numbers in the intersection {bit in the middle} multiplied
What is the LCM of 19?
19
Put the factors of 6 and 15 in a Venn diagram
Work out the HCF and LCM
HCF = 3 LCM = 2 X 3 X 5 = 30
Factors { 2 , 3 , 5}
What is 1 squared?
1 X 1 = 2
What is 2 squared?
2 X 2 = 4
What is 3 squared?
3 X 3 = 9
What is 4 squared?
4 X 4 = 16
What is 5 squared?
5 X 5 = 25
What is 6 squared?
6 X 6 = 36
What is 7 squared?
7 X 7 = 49
What is 8 squared?
8 X 8 = 64
What is 9 squared?
9 X 9 = 81
What is 10 squared?
10 X 10 = 100
What is 1 cubed?
1 X 1 X 1 = 1
What is 2 cubed?
2 X 2 X 2 = 8
What is 3 cubed?
3 X 3 X 3 = 27
What is 4 cubed?
4 X 4 X 4 = 64
What is 5 cubed?
5 X 5 X 5 = 125
What is 10 cubed?
10 X 10 X 10 = 1000
What is the square root of 100?
100 squared is 10
What is the square root of 144?
144 squared is 12
What is the square root of 25?
25 squared is 5
What is the square root of 4?
The square root of 4 is 2
What is the square root of 64?
64 squared is 8
What is the square root of 225?
225 squared is 15
What is 4 squared X 16 squared?
4 squared X 16 squared = 8
What is another way of writing 5 X 5 X 5 X 5 X 5 X 5?
5 to the power of 6
What is another way of writing 7 X 7 X 7?
7 cubed
What is another way of writing 1/2 X 1/2 X 1/2 X 1/2 X 1/2?
(1/2) to the power of 5
Must have fractions in brackets
What is 8 squared times 8 cubed?
8 to the power of 5 = 8 X 8 X 8 X 8 X 8
What is 8 to the power of 5 divided by 8 to the power of 3?
8 to the power of 2
8 X 8 X 8 cross of the three 8’s
Simplify 3 squared X 3 cubed
3 to the power of 5
Simplify 4 squared X 4 to the power of 5
4 to the power of 7
Simplify 10 to the power of 7 divided by 10 to the power of 5
10 squared
Simplify (6 to the power of 9) squared
6 to the power of 18
Simplify 8 to the power of 9 divided by 8 to the power of 5?
8 to the power of 4
Simplify 12 to the power of 15 divided by 12 to the power of 12?
12 cubed
Simplify (2 to the power of 5) squared - 1000
2 to the power of 10 - 1000
What is 49 X 6?
294
What is 831 X 16?
13,296
How do you read napiers bones?
You read napiers bones left to right
How do you write napiers bones?
Write napiers bones right to left
What is 752 divided by 4?
188
What is 924 divided by 18?
51.3 reccuring
What is an integer?
An integer is a whole number
- 453 rounded to:
a) The nearest 10
b) The nearest integer
c) To 1 decimal place
d) To 2 decimal places
a) 50
b) 45
c) 45.5
d) 45.45
What is a significant figure?
It is the first non-zero digit of a number
Round 346.9 to 2 significant figures
350 {keep the value at the original number, it stays at 100, so not 35
What is a coprime?
Two numbers that only have 1 as their common factor
Eg) 35 = 7 X 5 X 1
Round 67.8 to one significant figure
70
Round 39.9 to 2 significant figures
40
How do you estimate using significant figures?
Round to 1 significant figure and if the calculation isn’t easy round again
+ 2 + + 5 = ?
7
+ 2 + - 5 = ?
-3
+ 2 - + 5 = ?
- 3
+ 2 - - 5 = ?
7
What does the
Smaller than
What does the
Smaller than or equal to
What does the > sign mean?
Greater than
What does the > sign mean?
-
Greater than or equal to
+ X + = ?
+
+ X - = ?
-
- X + = ?
-
- X - = ?
+
+ divided by + = ?
+
+ divided by - = ?
-
- divided by + = ?
-
- divided by - = ?
+
-5 X -7 = ?
35
