For parents

Subtraction within 20

by Bhavini Pandya April 30, 2020

This What’s in my tray? activity will help your child develop their subtraction skills with numbers up to 20.

  • Maths (KS1)
  • Simple and easy to create at home

What to do:

  • Collect milk lids (20 of each colour if possible).
  • Write numbers to 20 on them (use a permanent marker).
  • Fill a container with water.
  • Put the milk lids into the water and mix around.
  • With a drainer or ladle scoop one number of each coloured lid.
  • Place them down and write the subtraction calculation.
  • Solve the calculation- use a numberline or counting objects to help.