• Mastery PD Materials

Counting, unitising and coins

Spine 2: Multiplication and Division – Topic 2.1

Introduction

Explore the concept of unitising by counting in units of two, five or ten; investigate how objects can be counted efficiently by counting in units other than one; apply unitising in the context of the low-denomination coins (1 p, 2 p, 5 p and 10 p).

Teaching points

  • Teaching point 1: We can count efficiently by counting in groups of two.
     
  • Teaching point 2: We can count efficiently by counting in groups of ten.
     
  • Teaching point 3: We can count efficiently by counting in groups of five.
     
  • Teaching point 4: A coin has a value which is independent of its size, shape, colour or mass.
     
  • Teaching point 5: The number of coins in a set is different from the value of the coins in a set; knowledge of counting in groups of two, five or ten can be used to work out the value of a set of identical low-denomination coins.
     
  • Teaching point 6: Knowledge of counting in groups of two, five or ten can be used to work out how many identical low-denomination coins are needed to make a given value.

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