These little puzzles are great for teaching numbers. One side presents the "problem" (either a counting tile, like 3 bees, or a math tile, like 1 apple being subtracted from 3 apples), the other side that fits is a number-- the correct answer.
But with one kid at 5 and one at 3... Well, one does math and the other is still learning to count. So we just use some bags to divide up the math tiles and counting tiles. There are enough numbers for either at any time, so we just let those sit in the box. Cheap, but a great way to reduce setup time and reduce frustration for the kid playing.