Counting and Measuring with Lego

Use numbered lego blocks to play some fun maths games with kids! Great for recognising numbers, counting, ordering and measuring in a hands-on, kinaesthetic and most importantly, playful, way! Counting and measuring with lego: preschool maths game!

Welcome to another idea from our Playful Maths series, co-hosted weekly with Debs from Learn with Play at Home! This week we are sharing maths activity ideas using lego and duplo blocks, which lend themselves fantastically to a huge range of mathematical concepts from sorting and matching, to patterning, counting and measuring!

Lego number blocks and lots of ideas for using them in maths games

Counting and Measuring with Lego Blocks:

For this simple activity I found 20 lego duplo blocks in various colours and wrote the numerals from 1-20 on the sides of them, using a permanent marker. On an opposing face of each one I drew the corresponding number of dots so that they could be counted to match the correct amount. Then we lay them out on the floor with the numbers showing and set the challenge to out them into a tall tower in the right order.

Can you do it all by yourself? Use the dots to help you if you don’t recognise the numeral!Counting lego blocks

Cakie had no problem ordering the numerals 1-12 quite easily, then as is often the case with preschool age children, she started to find it more of a challenge to recognise the teen numbers. She automatically began to count the little dots on the sides to help her and was able to correct herself and recount when she missed one. Counting, ordering and measuring with lego

After that she took the completed number tower and started to use it to measure with. This was her own idea, probably prompted by the measuring activities we have done in the past such as measuring with handprints and measuring using egg cartons. She laid or stood the tower next to each object then broke off the cubes that weren’t needed and counted how many were left.

Measuring with lego blocks

She wanted to measure Pop but found she didn’t have nearly enough Lego blocks, so settled for seeing how long her arm was instead and decided to find more blocks later to make a much bigger measuring device!Using lego to measure objects

More games that can be played with the numbered lego blocks:

  • count them into blocks of 5 and then 10 and use to count in 5s or 10s (make more to reach 100)
  • build them horizontally and use them as a number line to count along with a counting stick, prop or finger
  • use them to find matching number bonds to make 10 and then 20
  • pick 2 blocks at random and put them next to each other to become and double digit number and read it
  • pick 2 blocks at random and add together the totals on their faces, using the dots to count

lego number towers

Now pop over to see Deb’s fantastic Patterning with Lego Blocks activity too. I love how she incorporated toy people into the mix!

What they are learning as they play:

maths: recognising and naming numerals, counting up to 20, counting using 1:1 correspondence, ordering

Cakie: 4.6

Pop: 3.0

Bean: 13 mos

More maths fun with lego!

Lego Pattern Cards in an Egg Carton

Search the Playful Maths archive!


  1. says

    Lots of fun! I actually have a set of megablocks that we just don’t use because we’re always using our duplo so I have no qualms with writing on them. Love how Cakie started measuring with it. Perfect measuring device!

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