Here are three maths puzzles presented by the sprite girl, Avery. Press a button for a Puzzle. Read it slowly in the bottom corner. The butterfly might prove to be helpful as you think of your approach. Click the colour underneath to get to the solution (and the approach). Then Avery will give her solution and how she did it using Scratch code.
There are six more maths puzzles at ../projects/280702754 and ../projects/280699416 All three are grouped together in Numeracy studio at https://scratch.mit.edu/studios/5999446/