Fractions

Revision

Lesson

EQUIVALENT FRACTIONS

• Fraction that is worth the same as another fraction but looks different. Eg. 1 = 2

2 4

• Useful for canceling fractions(simplest form) and addition/subtraction.

How to change fractions(Do the same to top and bottom)

x4

2 = 8

5 20 x4

Top heavy or Improper Fractions

• Fractions which have a larger top (numerator) than bottom (denominator)

• Have a value of more than 1

• Can switch from mixed number to top heavy fraction easily

• Useful for addition, subtraction, multiplication and division

Addition/Subtraction

• Denominators must be the same.

• Use equivalent fractions to change if necessary

• Check to see if your answer will simplify.

3 1 - 2 3 2 4

• Change to top heavy 7 - 11

2 4

• Make denominators the same 14 - 11

4 4

• Subtract numerators 3

4

What about addition?

Exactly the same process as subtraction but add instead.

How do we multiply?

No. Not that sort of multiplying.

3 1 x 1 3 3 4

• Make into top heavy fractions 10 x 7

3 4

• Multiply across the top and then the bottom

70

12

• Cancel down your answer 5 10 = 5 5

12 6

What about division?

The same as multiplication

except……..

For one sneaky bit1 2 / 3 5 3 6

• Change to top heavy fractions 5 / 23

3 6

• Instead of dividing, ‘flip’ the divisor and multiply 5 x 6 = 30

3 23 69

• Simplify by canceling 30 = 10

69 23

That’s all folks!