Addition and Subtraction strategies

This term we have been learning about addition and subtraction strategies.

In addition, some strategies we have been practising are:

  • Bridge to ten – where you add to the closest ten
  • Using the algorithm where you add the ones first and you might need to rename.
  • Splitting a number into an easier number to add. For example splitting a number into tens and ones then adding them together.
  • Using the number line to add easier numbers.
  • Counting on by ones
  • Skip counting by 2s, 3s, 4s and so on.

In subtraction, some strategies we have been practising are:

  • Algorithm where you take away the ones first and then you may need to rename.
  • Counting backwards by a counting pattern
  • Adding on from a smaller number
  • Using estimation to check our answers
  • Taking away the ones and then tens

What other strategies do you know? What else do you know about addition and subtraction? How might you use this in real life? 


Shape – post by Georgie

This term, one of our math topics has been shape. Our focus was in symmetry, which included rotational symmetry and reflection symmetry. We did 4 different activates and they were:

  • drawing rotational and reflection shapes
  • putting pictures in grids
  • using the computer for activities
  • using pieces of cut out paper to make pictures

We also learnt about tessellation. This is when shapes are joined together with no gaps. We learnt about MC Escher, from the Netherlands, who made lots of tessellation artworks and optical illusions. So we got one piece of card that we drew then cut out to make our own tessellations. Here are some of the patterns we made:

Where have you seen tessellations in real life? Have you ever learnt about Escher? If so, what do you know about him? Have you seen symmetry in real life? If you have can you tell us?


This term, 3/4W have been learning about data. These are some of the graphs we have made.

Graph 1

Graph 2

Graph 3

Graph 4

What do you know about data? Can you write a statement or a question for one of the graphs?

Shape in 3/4W

For the past couple of weeks, 3/4W have been learning about shape. We have learnt that:

  • Polyhedrons are 3D shapes that have flat faces and can stand up.
  • Pyramids have an apex and triangular faces that meet at a point. They can stand.
  • Spheres have no faces but they have a curved surface.
  • Equilateral triangles are triangles with all the same size angles.
  • Squares are a special type of rectangle because they have 4 right angles, like a rectangle. But rectangles are NOT squares.




We also entered the Victorian Coding Challenge by producing some shapes using Scratch. Have a look at some of the things we made! Octagon Square Star in the sea Circle

What other things do you know about 2D or 3D shapes?