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45 Cards in this Set
- Front
- Back
To multiply by a power of 10 |
move every digit to the left
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To divide by a power of 10
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move every digit to the right
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To work out how much to move the digits |
count the number of zeroes in the power of 10
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To multiply decimals
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calculate the answer without any decimal points, then put the decimal point back in. The number of decimal points in the question is the same as the number of decimal points in the answer
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Area |
the amount of space inside a two dimensional shape
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Units of measurement for area |
are distances squared e.g. kilometres squared, square inches, cm2
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Area of a rectangle
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length x width
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Area of a triangle
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1/2 x base x height
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The base and height in a triangle
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are always perpendicular (at right angles)
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Multiple
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is the result of multiplying any number by an integer
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Common multiple
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a multiple of all the numbers listed
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Lowest common multiple (LCM)
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smallest number that is a multiple of all the numbers listed
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To square a number
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multiply it by itself.
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To cube a number
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multiply it by itself three times.
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The power of a number tells you |
how many times to multiply the number by itself
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Two other words for power are
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index and exponent
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Inverse of squaring
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a square root
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Inverse of cubing |
a cube root
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Quotient
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the result of a division calculation
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Dividend |
the number that is being divided
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Divisor
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the number that you divide by
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To write a remainder as a fraction
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the remainder is the numerator; the divisor is the denominator
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To write a remainder as a decimal
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keep adding zeroes to the end of the number until there is no remainder or you spot a recurring pattern
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To divide a decimal by in integer (decimal dividend) |
there is no need to change anything
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To divide anything by a decimal (decimal divisor) |
scale up both the dividend and divisor by the same amount to make the divisor a simple integer
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The divisibility test for 5 |
if the number ends in 5 or 0
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The divisibility test for 10
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if the number ends in 0
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The divisibility test for 2 |
if the number ends in an even number
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The divisibility test for 4 |
if the final two digits are a multiple of 4
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The divisibility test for 3
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if the sum of the digits is a multiple of 3
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The divisibility test for 9 |
if the sum of the digits is a multiple of 9
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Divisibility tests for other numbers |
can be created by performing both divisibility tests for a factor pair of the number
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Factor
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a number that divides exactly, without leaving a remainder
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Factor pair
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a pair of factors that if multiplied together, give the number
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Common factor
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a factor of all the numbers listed
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Highest common factor
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the biggest number that divides exactly into all the numbers
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To find the HCF from a Venn diagram |
multiply the numbers in the overlapping section
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To find the LCM from a Venn diagram
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multiply all the numbers in the Venn diagram
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The order of operations tells us
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we always do groupings first, then exponents and roots, then multiplication and division, and finally addition and subtraction (GEMS).
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Groupings can be shown |
by using brackets, as numerators or denominators in fractions, or in roots
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The mean average
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mean= sum/count
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To find the midpoint of 2 numbers |
add them together and divide by 2
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Inverse of multiplication
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division
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Inverse of division |
multiplication
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To rearrange an equation |
do the same thing to both sides
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