Number Flashcards
How many pounds to the kilogram?
2.2 pounds.
How would you find out the cost of an item with a discount of 15% if the original cost is £581.58?
581.58 X 0.85 = 494.34
How many pints to the litre?
1.75 pints.
How many gallons to 4.5 litres?
1 gallon.
How many miles to 8 kilometres ?
5 miles.
£600 is invested for 7 years at 0.04% with a compound interest.
What is the final amount?
600 X (1.04^7) =£789.56
The sale price of a television is £350. It has been reduced by 30%. What was the original price?
350/70 is 5
5 X 100 =£500
The original price was £500.
If a number is put to the power of a negative number, what do you do?
Calculate the power as if it was positive and then find the reciprocal.
If you have (a^Z) ^Y what do you do?
The result will be a^ZY
What is the answer to 9^3/2?
Think of it as (9^0.5)^3
This is 3^3 which is 27
What do you do if you have a number to power of 1/2 or 1/5?
Find the square root or the root 5 of it.
What is an arithmetic sequence?
A sequence where the distance between numbers is always the same.
3 ,10 ,17 ,24
Here are the first terms in a sequence.
What is the equation for this sequence?
Well each one is 7 more than the last.
3-7 is -4
7n-4 is the answer.
Change 7.5 m^2 to cm^2
- 5m is 750cm (x100 to get the answer)
7. 5^2 is 75000cm^2 (x100^2 to get the answer)
With the knowledge that 56 as a product of its prime factors is 2x2x2x7 and that 98 as a product of its prime factors is 2x7x7
What is the HCF and LCM of 56 and 98?
HCF
There is one 2 and one 7 in both so the HCF is 2x7. 14
LCM.
Multiply all the other numbers that you didn’t use to find the HCF.
Multiply the collections of prime factories together but without a 2 and a 7
2x2x2x7x7=392
How is the % loss calculated?
%loss = (loss/original) x 100
If you have to draw an inequality on a graph, what does it look like?
A full circle means could be equal to.
An empty circle means more or less than.
What is a minus number divided by a minus number?
A plus number.
-2x<10 is divided by -2. What is the answer?
X>-5
When dividing by a negative number, you must turn the pointing thing around.
If you have a fraction with a denominator with an indice in it, what do you do?
You would remove it by multiply the to value by it, but you have to minus the indice.
For example, 5a/b^2 will become 5ab^-2
When you divide a surd by a proper number, what do to you do?
Divide it by the proper number twice.
What is 28root7 divided by 7?
4root7
What is 3root7 times by root7?
21
