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Fractions of quantities: L2: Singapore's otters

2 - Whiteboard Challenges

The Lesson

In this exciting lesson, you will have an opportunity to show your understanding of halves, thirds, quarters and fifths, whilst solving a variety of fraction problems that relate to the fascinating clip that you watched at the start of the lesson and the animals that it featured.

Useful prior knowledge: 

  • To know what is meant by the numerator and the denominator in a unit fraction.
  • To be able to recognise a half (1/2), a third (1/3), a quarter (1/4) and a fifth (1/5).
  • To be able to calculate unit fractions of small quantities (e.g. 1/2 of 8, 1/4 of 12 etc.)

Did  you know?

Smooth-coated otter pups are blind and helpless at birth. Their eyes only open at around four weeks. At six weeks, they start learning how to swim.

Whiteboard Challenges

Divide the bars and draw counters to solve the problems below.

A group (bevy) of 15 smooth-coated otters were wandering the through the backstreets, gardens and parks of Singapore.

1) 1/3 of the otters in the group were adults and the rest were pups.

How many adult otters were there?

2) 1/2 of the pups were less than 3 months old.

How many pups were less than 3 months old?

3) 1/5 of this entire otter group ganged together and chased after a dog!

 How many otters in this group chased after a dog?