My children loved using the red rods and number rods like interger bars. They could look at a red rod and tell immediately how many 10 centimeter units there were. One game was matching a long red rod with different number rods. My son called these fractions. It’s very similar to this lesson. With the Montessori rods, the fractions are tenths. My children enjoyed using Cuisenaire Rods or Interger Bars in addition to the number rods.