Number 2 Flashcards
How do you simplify a fraction?
Divide the top and bottom by the same number until they won’t divide any more
Round 465 to the nearest 10
470
What is the value of 1,sup.18</sup> ?
1
What is the first step in multiplying two mixed numbers?
Change them both into improper fractions
Which digit in
0.1035
is the second significant figure?
The second zero
How do you multiply two numbers in standard form?
Multiply the numbers together
and
add the powers on the 10’s
What is the first thing you need to do to add 3/8 and 1/6 ?
Find equivalent fractions using a common denominator
What is 0.53 as a fraction?
53/100
What is meant by the error interval when a number has been rounded?
The range of values the actual value could have taken before rounding
How do you raise a fraction to a power?
Apply the power to both the top and the bottom of the fraction
e.g.
(5/8)2 = 25/64
Evaluate 2/5 + 1/3
2/5 + 1/3
= 6/15 + 5/15
= 11/15
Round 2.498 to 2 decimal places.
2.50
True or False?
A fraction is in its simplest form if the numbers on the top and bottom of the fraction have no common factors?
True
What is the value of 50 ?
1
What is the symbol for ‘approximately equal to’ ?
≈
What do you need to do to write one number as a fraction of another?
Write the first number over the second number.
Cancel down if you can
What is 20% as a decimal?
0.2
Is 12 x 104 in standard form?
No the first number has two digits before the decimal point
A length is rounded to the nearest centimetre.
Up to how much bigger could the actual value be than the rounded value?
Half a centimetre
What are the square roots of 36 ?
6 and -6
How do you divide two powers of the same number?
Subtract the powers
x = 4.7 rounded to the first decimal place.
What is the error interval for x ?
4.65 ≤ x < 4.75
What is 3½ as an improper fraction?
7/2
What is the first thing you should do to order fractions?
Rewrite the fractions with a common denominator
How do you estimate an answer to a calculation?
Round all the numbers to 1 significant figure,
then do the calculation with the rounded numbers
How do you convert a decimal to a percentage?
Multiply by 100
True or False?
If the digit after the place you are rounding to is a 5, the last digit in the rounded number stays as it is.
False
the last digit is rounded up
(increased by 1)
If a number is in standard form, between which two values should its first number be?
1 ≤ x < 10
What is the first step in multiplying two improper fractions?
Multiply the tops
and bottoms separately
What do you need to do to the powers to work out (82)4 ?
Multiply them.
(82)4 = 88
What do you need to do to convert a fraction into a decimal?
Divide the top by the bottom
What is the integer part when 28/3 is converted into a mixed number?
9
How do you multiply two powers of the same number?
Add the powers
What is the first significant figure of a number?
The first digit that is not a zero
What do you do when you divide fractions?
KFC
Keep the first fraction
Flip the second fraction upside down
Change the ‘÷’ for a ‘x’ (and multiply)
What do you do first when you add to numbers that are in standard form?
Change them into ordinary numbers
How do you find a fraction of a number?
Divide the number by the bottom of the fraction,
and then multiply the result by the top
What is 13.685 rounded to 1 decimal place?
13.7
16.2 x 7.7
is estimated by calculating 20 x 8.
Will this be an underestimate or overestimate?
Overestimate
Both numbers in the estimate are bigger than the original numbers
When a number is rounded to the nearest 100, its value is 700.
What is the minimum value of the original number?
650
