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maths year 11 > percentages > Flashcards

percentages Flashcards

1
Q

What is 1/4 as a decimal and percentage?

A

0.25 and 25%

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2
Q

What is 1/ 10 as a decimal and percentage?

A

10% and 0.1

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3
Q

What is 3/ 4 as a decimal and percentage?

A

0.75 and 75%

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4
Q

What is 1/5 as a decimal and a percentage?

A

0.2 and 20%

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5
Q

What is 1/3 as a decimal and a percentage?

A

0.33333333… and 33.333333…%

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6
Q

What is 2/3 as a decimal and a percentage?

A

0.666666… and 66.66666….%

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7
Q

How do you find 10% of a number with out a calculator?

A

divide the number by 10

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8
Q

How do you find 50% of a number with out a calculator?

A

Halve it

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9
Q

How do you find 1% of a number with out a calculator?

A

divide the number by 100

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10
Q

How do you find 25% of a number with out a calculator?

A

Halve it and halve it again

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11
Q

How do you find a percentage of a number with a calculator?

A
  1. Turn the percentage into a decimal (% divide by 100)

2. Multiple the decimal and the amount ( decimal x amount)

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12
Q

How do you find a new amount after a percentage increase with a calculator?

A
  1. 100% + the % it is increasing (to get a % bigger than 100%)
  2. Turn the percentage into a decimal (% divide by 100)
  3. Multiple the decimal and the amount ( decimal x amount)
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13
Q

How do you find a new amount after a percentage decrease with a calculator?

A
  1. 100% - the % it is decreasing (to get a % less than 100%)
  2. Turn the percentage into a decimal (% divide by 100)
  3. Multiple the decimal and the amount ( decimal x amount)
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14
Q

How do find an original number before an percentage decrease (Reverse Percentage)

A
  1. 100% + the % it is decreasing (to get a % more than 100%)
  2. Work out the multiplier by turn the new percentage into a decimal (% divide by 100)
  3. divide the amount by the multiplier
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15
Q

How do find an original number before an percentage increase (Reverse Percentage)

A
  1. 100% + the % it is decreasing (to get a % more than 100%)
  2. Work out the multiplier by turn the new percentage into a decimal (% divide by 100)
  3. divide the amount by the multiplier
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16
Q

How do you calculate a percentage change/ loss/profit.

A

The difference in the amounts divided by the original amount x 100

maths year 11 (1 decks)

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