Dewch i Feddwl Mathemateg (9 i 11 oed) Gwers 2 Bwydo’r Pysgod

Introduction

Introduction Feeding the Fish
In this activity on ratio, children use the relative sizes of fish to calculate how much each fish should be fed. They note the differences between a sequence of doubling and one increasing by 50% each time.
Episode 1:
Children discuss a way to measure the relative proportions of a family of fish which doubles in length for each subsequent fish. They use these proportions to calculate how much each fish should be fed, based on their knowledge of the smallest fish.
Episode 2:
Children discuss a way to measure the relative proportions of a family of fish which increases in length by 50% for each subsequent fish. They use these proportions to calculate how much each fish should be fed, based on their knowledge of the smallest fish. The children compare the two fish families and their relative proportions.
Alternative episode for younger students:
Children discuss a way to measure the relative proportions of a family of fish which increases in length and width by 50% for each subsequent fish. They use these proportions to calculate how much each fish should be fed, based on their knowledge of the smallest fish. They compare this proportional increase to the doubling in length for Episode 1.
Reflection
Aims
  • Pupils work on visual comparison of sizes in pictures and look at ratios
  • Pupils begin to work on comparing ration and fractions

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    Materials
    Supplied

  • Resource Sheet A showing two fish
  • Resource Sheet B showing a family of four fish
  • Resource Sheet C showing a family of three fish
  • Resource Sheet D showing a family of three fish

    • not supplied

  • Multilink in a range of colours
  • Rulers (optional)
  • Scissors (optional)
  • A1 large squared paper (optional)
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    Before you teach
    Photocopy Resource Sheet A enlarging to A3 size. Photocopy Resource Sheets B and C – one per group.
    Vocabulary
    Measure, increase, double, one and a half times bigger, length, width, size

    License

    Gwersi PCAME a Dewch i Feddwl Mathemateg (9 i 11 oed) Copyright © by Ann Longfield, David Johnson, Jean Hindshaw, Linda Harvey, Jeremy Hodgen, Michael Shayer, Mundher Adhami, Rosemary Hafeez, Matt Davidson, Sally Dubben, Lynda Maple, and Sarah Seleznyov. All Rights Reserved.

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