Fun Math Activities for Numbers 20 to 99

Tuesday, February 24, 2015


So we’ve been practising our Mathematics since we came back from our big break.  We’re almost done with our study on 2 digit numbers (20 to 99).  Now you might be wondering why we need to stick around here. Well you see, though Mavi knows his addition and subtraction by heart, there’s still a lot more in mathematics than that.  To explain, here’s a few of our “brainy” activities (this is how Mavi describes it!).

Count Me!.  Using our decanomial beads, I laid out 20 sets for Mavi to count using what he has learned previously on counting tens and ones! 


Place Value.  Here’s it is in Singapore Math. I copied the activities in our Math notebook so that we can reuse the workbooks from Singapore for Vito.  Mavi works on this using mental math, no manipulative needed.


Find the number. This thinks that this is a very tricky game. I made a lot of questions and clues for him to find the correct number using our hundred board.  This is to test his analysis. Example:   8 less of 35 is?


Smallest and Greatest number. Given the number series (I prepared 10 for him), identify the smallest and greatest.  Again he finds this difficult, but upon teaching him the trick, he was able to answer the questions quickly.


Another version is to arrange the given set (15 sets) from smallest to greatest and greatest to smallest. Arranging from smallest to greatest was very easy for him, but he complained that doing the other way around is more difficult. He gets confused between numbers.  I even added 1 digit number (number 6), to my surprise he considered it as “60” rather than “06”.  So I therefore conclude that conventional counting, that is from smallest to greatest is waaay more easier for them than the other way around!

                 DSC_0613 DSC_0618

Why don’t you try this with your kids and let me know how they feel about it! 

More math activities here!

Follow Pinay Homeschooler's board Math Ideas on Pinterest.


  1. This comment has been removed by a blog administrator.

  2. The hundred board is so cool! Love that. Math + games = fun learning!!

    Katie @ Cup of Tea

  3. I love all your math posts because one day I plan to come back and reference them! :) Thanks for all your hard work and educational posts.