# Maths

• Created by: Mollie24
• Created on: 18-06-16 09:03
Estimate answers and use place value
Estimate 0.384729 and 2.2955= 0.400000 and 2.00000 Place value = M HT T H T U . D
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Change fractions into decimal into percentage
onverting a fraction to a decimal. To change a fraction to a decimal, you divide the top number by the bottom number (divide the numerator by the denominator)
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How to find 15% of an amount
Example: If the number selected is 43: Multiply by 3: 3 × 43 = 129. Divide by 2: 129/2 = 64.5. Move the decimal point one place to the left: 6.45. So 15% of 43 = 6.45.
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comparing fractions
Find what both the denominators can go into then change it: 2/3 or 3/5 change the denominator to 15. Then times the numerator with what it needs to get to 15: 3/5 = 9/ 15 and you do the same to the other fraction
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Exchange rates for money
To change British money to foreign money - multiply by the exchange rate. FOREIGN CURRENCY = BRITISH CURRENCY x EXCHANGE RATE
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Use proportion in a recipe question
Eg. 37g flour ect how many would she need for 21 people > times 37 by 12
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Simplify expressions and factorise
To work it out: Write down the expression Equation: x + 5 + 3x - 7 + 9x + 3 - 4x Collect all the terms together which are alike. Remember that each term comes with an operation (+, -) which goes before it. Equation: x + 3x + 9x - 4x + 5 - 7 + 3 Simpl
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Substitute numbers into an expression
For example , what is the value of 4p3 when p = 2? We know that 4p3 means 4 × p × p × p, so when p = 2 we substitute this into the expression: 4 × 2 × 2 × 2 (or 4 × 23) = 32
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Solve 2 step equations
It takes two steps to solve an equation or inequality that has more than one operation: Simplify using the inverse of addition or subtraction. Simplify further by using the inverse of multiplication or division
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Tessellate a shape
A Tessellation (or Tiling) is when we cover a surface with a pattern of flat shapes so that there are no overlaps or gaps. A regular tessellation is a pattern made by repeating a regular polygon. A semi-regular tessellation is made of two or more reg
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Congruent shape
Two polygons are congruent if they are the same size and shape - that is, if their corresponding angles and sides are equal. Move your mouse cursor over the parts of each figure on the left to see the corresponding parts of the congruent figure on th
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Use a train timetable and a mileage table
The following table shows the times of the buses from Cambridge to Duxford and Whittlesford: Cambridge 0705 0805 0835 0905 Trumpington 0716 0816 0846 0916 Great Shelford 0722 0822 0852 0922 Stapleford 0725 0825 0855 0925 Sawston 0732 ........ 0902
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Describe a correlation of a scatter graph
With scatter plots we often talk about how the variables relate to each other. This is called correlation. There are three types of correlation: positive, negative, and none (no correlation). Positive Correlation: as one variable increases so does th
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Interpret a pie chart
The angle of this section is 36 degrees. The question says there are 30 pupils in the class. So the number of pupils of height 121 - 130 cm is: 36/360 x 30 = 3
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Use a probability scale
The probability scale. Maths uses numbers to describe probabilities. Probabilities can be written as fractions, decimals or percentages. You can also use a probability scale, starting at 0 (impossible) and ending at 1 (certain).
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Find the probability of an event
To find the probability of two independent events that occur in sequence, find the probability of each event occurring separately, and then multiply the probabilities. This multiplication rule is defined symbolically below. Note that multiplication i
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## Other cards in this set

### Card 2

#### Front

Change fractions into decimal into percentage

#### Back

onverting a fraction to a decimal. To change a fraction to a decimal, you divide the top number by the bottom number (divide the numerator by the denominator)

### Card 3

#### Front

How to find 15% of an amount

### Card 4

#### Front

comparing fractions

### Card 5

#### Front

Exchange rates for money

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